Both opponents strength seems unpredictable. Namibia has had the biggest gaps in performances in the group (f.e. 1:1 home and 2:8 away against Egypt, 0:0 against Morocco but 0:4 against Algeria in their other home matches). And Algeria will come out of a summer break (they were idle last weekend) and will play without most of their European based stars (only three have been invited) so that they do not resemble the team that hosted Senegal or Morocco. 
Morocco who had looked like the more lucky of the three yet (at Egypt and Algeria, the 'unseen' goal against Senegal) in return have received their share of bad luck in the schedule: They can only sit and watch while the other two will likely go for a goal hunt against depleted opponents.

The schedule confusions:
Many, and so me, were surprised to learn last Monday in BBC, Reuters, and AFP (Agence France Press) reports that the deciding Group C matches  were about to take place this Saturday. All three reports made it sound like the change of the schedule had just been made. AFP, normally the best informed source, themselves spoke of  'a surprise move' (in one report, and raised some questions in a second report). 
A few days later  I / The Shot posed some serious questions connected to the matter here on this page, which unfortunately led to some Egyptians feeling accused of an unfair ongoing. I had felt very strange about the fact that a suggested shorthanded change would have left Algeria, Egyptian opponents with no time for legal call-ups of professionals and only few hours to collect an unprepared homebased squad from summer holidays. Also the change meant a switch in the original successsion of the matches.

But in the end it helped to lift the fog: mails from Egypt convinced me that the change in the schedule had indeed been made long ago to avoid a collision with the Zamalek Cairo involvement in the FIFA World Club Championships (which meanwhile have been called off, unfortunately).
So: It is NOT a surprise move and the headaches about the reports have been cleared.

There was a second discussion point: the kick-off times. Egypt was about to kick off four hours later than Senegal, which would have given them the advantage to know the result of the Senegalese in advance.
The reasons given by the Namibian and Algerian hosts: In Namibia (south of the equator and so in winter) dark settles early and floodlight facilities are inadequate at the stadium at Windhoek.
Algeria said that it is too hot to play in the middle of the summer during daytime.

Very late FIFA ruled both matches to be played at 1500 GMT. One might consider it a disadvantage for Egypt to play in such a heat, but I think it more likely it will affect the team which is less motivated anyway, the Algerians. Add to it the fact they come out of a summer break and have not played last weekend, so should not be in a good form.
Although it seems much more fair from the competition point of view, a serious but remains:
I hope FIFA has checked very well before with doctors about that change. With the World Cup in front of their eyes some Egyptian players might be willing to ask too much from their bodies. 
There have been World Cup matches played in such a midday and afternoon heat at Mexico 70, 86 and USA 90, so maybe the problem is controllable. But I hope it has been checked thoroughly upon before.

What still remains are the general headaches about the design of the qualifiers. For example about Morocco having their chances cut by the fact that neither the Algerian nor the Namibian team will look like the one they had to play against and it seems very unlikely both will hold their opponents on Saturday..

All those troubles have been predictable: They are a consequence of an overambitious schedule with 5 teams in a group. This meant from the beginning weak teams would drop out early and finish great share of their campaign with depleted squads and improvising. CAF/FIFA has even been saved from further embarassment by the Ivorian slip at Congo. Otherwise, with Tunisia idle because of the 5 teams format, there would have been a bizarr Ivorian goal hunt against the DR Congo at Abidjan next weekend which would have triggered any kinds of speculations if successful.
The deciding matches have been scheduled into the summer break for most countries: it was clear this would mean, especially the teams without chances left would come up with some strange performances. Suddenly results exploded in recent weeks, Congo 0:6 at Tunisia (before only 0:2 at Côte d'Ivoire), Madagascar 0:6 at Côte d'Ivoire (before only 0:1 at Congo), and Namibia with that helpless 2:8 at Egypt which easily could have been 0:15 with some more luck for the Pharaos.
In Africa it is not as easy as in Europe to maintain playing matches though already out of the qualifying picture. Involving teams like Namibia, Congo, Madagascar, Malawi, or Sierra Leone, which cannot be expected to play another role than the one of the unpredictable, is adding a lottery factor to the qualifiers. Those teams often have two or three coaches and entirely different squads throughout such a long campaign.

There will remain a strange and undeserved feeling whoever will qualify (unless it is Morocco). If Egypt just achieve what they need. Or if Senegal win by 6,7, or 8 at Namibia. The CAF is known for quick rule changes during tournaments (see U20 African Youth Cup). They could ask both federations whether they would agree to decide it by a match on neutral ground instead, if both win on Saturday. It would look more bright and less bizarr than a goal hunt against depleted opponency. 
But it is an unrealistic idea and unfair to Morocco.

All three of them, Senegal, Egypt, and Morocco, would be great representants for African Football to go to the World Cup for different reasons:
Morocco would be great because they have a great team and with the experience from last World Cup they could tackle the tournament in an improved and confident manor, and might be able to play a good role. 
Egypt would be great because they have a maybe even stronger team and a great design of their game. They are always well prepared and have some huge talents. Their only problem is the difference between confident and anxious (periods of) matches.
Senegal would be great because from the design of their game and the spirit of the squad they are a role model for the subsaharan African Football. Their fighting spirit and team structure could make them a real World Cup surprise and they might be the biggest threat of those three to (prominent) non-African teams.