Brighton is like another version of Nottingham Forest, but unlike them, they need to feared because of how well the players play and how any of them can score. Aaron Wan-Bissaka will have to keep Kaoru Mitoma calm min the game because he can become a lot of trouble for the suffering Manchester United Defense. Diogo Dalot will have to do the same at the other side against March, and in middle Maguire will face the pressure of an experienced Danny Welbeck.
Brighton is one of the teams that is able to make it difficult for big teams to achieve maximum results and if you look at their current performance it is very consistent. They could beat Manchester United quite easily considering the many problems Erik Ten Hag is currently facing. The three Brighton players you mentioned are devastating for Manchester United's defense and especially Karou Mitoma will definitely be very difficult to stop because he has speed and good dribbling.
Brighton is one of the team in the league that plays good flowing football, the game against Manchester united will be a close game it will be hard for United with there current form but anything can happen because Manchester united can turn up when you don't expect, and Manchester United home form last was good so I see them replicate it against Brighton considering there last week they will like to turn up and get a win to boost the team spirit.