It's not a serious problem for arsenal. I have seen some perfect candidates that can fill his position. It's tomiyasu or saliba. These guys were also able playing as centre back to replace him.
Arsenal shall not feel frustrated after seeing he got injured. Injury was something that could not be avoided. It's a common thing in the football. As long as arsenal will still have some guys who have ability to replace him and the club shall not feel worry about that.
Im sure that if arsenal will come back stronger. I have heard that if arteta will not be using havertz in the upcoming match.
Nahh I think he definitely would be missed, Arsenal do have a varieties of players that could slot in that defense for now but the Aerial ability of Gabriel cannot be matched in this current Arsenal squad. He could have easily been replaced if at all Timber is available but he is not so what I think Arteta would like go for his bringing in Tomiyasu and then moving Zinchenko to the right back position and White pairing with Saliba as the two center back. This could work only if it is against weaker teams with less aggressive attackers but if the attackers are aggressive then the calmness of both white and Saliba will be a problem for Arsenal.
Let me pretend to agree with what you claim about Brighton beating Man U throughout last week since I couldn't remember. What I will not agree with you is using what happened last season as the sole yardstick to judge what will happen this season, not to mention of an immediate one on Saturday this time that Erik ten Hag and his team are under much scrutiny. If at all I don't have any real trust for Man U, I still believe that it's not that bad for the team. Last season might have been awkward when met Brighton but the situation is different now, and they will do all it takes to win the next match after the ugly incidents that happened this season as fresh as it is. If at all I bet on this match, I will give Man U a straight winning and will not ever blink if I lose the bet.
In the last five encounters between the clubs Brighton have had a better of United wining three of those to United’s two, they were the only club that actually did a double over united last season. They have also started the season excellently again and at the moment could be bookmakers favourite to win the tie. But don’t get carried away against United because they have been so strong at home in the competition that I would back them to win any game at home. To be certain since the Arrival of Ten Hag only Brighton has actually won at old Trafford and it was the first game in the Premier League for Ten Hag, this shows how the manager has turned old Trafford to a fortress that can’t be defeated.