That's reason to say Manchester City will try hard to get the full three points against Brighton in the game they are going to have and betting on anything other than Manchester City winning this game seems like a loss for me.
I don't Manchester City in danger at all because only played 8 games and arsenal are ahead of them with just two points which I have believe the Manchester City will win against Brighton even though the key Players are in injury Brighton can not with stand Manchester City in any chance, if you can check their last 5 match Manchester City still have good record to win Brighton, I know Pep will not give out this chances at all for Brighton when there are at home I have much confidence that Manchester City will win.
With this important win, Arsenal with more confidence about themselves, will actually become a bigger threat for Manchester City in Premier League. It will be harder for Manchester City to win Premier League, to defend their trophy, in this season.
Arsenal have built up more confidence when they won against Manchester City but I can still say that this is still the beginning of the season and anything can happen, Manchester City next match is with Brighton which am expecting win from Manchester City but Arsenal are playing against Chelsea which are at the peak of recovering with two matches won before the international break which I expect that moral we still be with them, I know arsenal are very strong now but I have much confidence in Manchester City to win than Arsenal.