The possibility of Chelsea winning and causing a surprise like they did at home to Tottenham is very likely. but the percentage is very small.
You contradicts each other, Manchester City and Tottenham are completely different. Manchester City never make such big mistakes to lose 2 players in a match, they mostly play clean.
If Nkunku doesn't lose his sharpness like in Pre-season. So Nkunku's return to the field will definitely improve Chelsea's performance, especially in attack. Because Nkunku has actually proven himself to be a player that Pochettino can rely on in pre-season. But usually players who have just returned from injury will not immediately return to their best performance. So for the time being we might not expect too much from Nkunku. But it looks like it's time for Chelsea to return to their best performance. Pochettino is also required to bring good results for Chelsea this season. Because we know how Todd Boehly takes a stand if a coach cannot bring the club to the progress he hopes for. Don't let Pochettino suffer the same fate as Potter.
People already give a lot hope to Nkunku because he's expensive and he contributed a lot during the pre-season. If Nkunku can't play as good as he was, he will become Mudryk 2.0 where people always mocking him.
For a record, this one is the longest Nkunku's injury.