I don't think because Manchester United have improved themselves and if you see Manchester United drew the match against Liverpool even though Liverpool are very strong against Manchester United but still they couldn't win the match against Manchester United. Brighton's record is even worse than Manchester United's so I can imagine that Manchester United will win this match easily as they have improved their defense and players' hard work. Manchester United are working hard on themselves but they are not that strong right now but it will take them some time if they keep playing well it won't take them that long they will be strong soon and their will revert to previous performance. Your thinking is a draw because of injuries but I don't understand the concept of Brighton winning because Manchester United is much better than Brighton so Manchester United will win this match.
Manchester United improved themselves? It hasn't even been seen yet and when the results from Liverpool some time ago are used as a benchmark I think those or those who think Manchester United have managed to develop themselves and improve their performance should think again because in fact they are still the same without any significant differences and can be felt significantly.
Although it cannot be denied that some time ago they managed to win against Southampton but it also happened only because of 1 player who made a difference and of course even though it was good in the end we could also judge that Manchester United were not that good for now.
This week they will face Brighton, which although for now the quality of Manchester United players is still better but in terms of performance of course we can judge that Brighton is still superior and that is evidenced by the current standings so in this case when Manchester United are said to be winning easily then I think you have to lower expectations like that with the condition of Manchester United which is difficult to guess in terms of the final result in a match.