This will be the tough game of the week, The Arsenal against Brighton match will not be that tough because we all know that Arsenal is going to defeat Brighton, Arsenal defeated Aston Villa last week even when Aston Villa was very serious and they didn't want Arsenal to score a goal in the match and at the end of the match Arsenal score two goals and get a three-point, Arsenal is capable of defeating Brighton unless the team doesn't want to get any points and allow Manchester city to be the one to win the league title this season again.
And about Manchester United against Liverpool, we all know that Manchester United is not in a good position to play Liverpool, Liverpool will beat Manchester United by winning 3 goals with the way I see it, the Manchester United coach is not good and also there are some players's that are not good in the team, so I don't even expect any winning from Manchester united but if they win the game that will be a lucky game for them.
Arsenal will host their next game against Brighton, and based on both teams' performances, Arsenal is the favorite to win, many people believe that Brighton could be a threat to Arsenal because they defeated Manchester United in their previous game, but I am confident that Arsenal will defeat Brighton without conceding a goal.
You are right, Brighton beating Manchester united in their previous encounter does not mean that Brighton will be too hard for Arsenal to eliminate, but how ever, this is not me undermining or underrating them(Brighton), since I understand that as much winning win games like football has everything to do with how good and skillful a team is, there is still an atom of luck that plays a role at times.
But all the same, Arsenal sure have the ability to beat Brighton without conceding a goal, but we never can say never, only the final whistle can tell what the true scoreline is, and for me, whether Arsenal concedes a goal from Brighton or not, what matters is that they (Arsenal) should win the match.
On the other hand, I think it is too early to predict that Manchester United will lose to Liverpool because Liverpool always struggled to beat them. However, if I'm not mistaken, Liverpool weren't able to beat Manchester United in the Premier League last season, and when they met in the FA Cup, Manchester United eliminated Liverpool in extra time, so we shouldn't expect Liverpool to beat Manchester United by three goals because Manchester United didn't add many players to improve their performance last season and they've already added about ten players to the squad, If Manchester United defeats Liverpool, I won't be surprised and won't call it lucky because we can't expect a team to lose games after signing so many players.
As much as I agree with you, I can't help but want to point that to you that a club winning or losing after signing so many players is actually possible, winning depends on the type of players the club in question signed, and this brings me to the question, werent those new signed players, or some of them perhaps, on board when Brighton beat Manchester united Last week?