Regarding Mason Mount, he had good performances in Chelsea and helped his teams while he is also a young player and he could be a good investment for this team while Chelsea is losing the players they have, and Mason Mount, is going to also leave this team while Arsenal is trying to hire this midfielder for the next season.
Chelsea lost many of their players in the transfer market this season. and now their new coach must quickly assemble their squad and prepare to start the new season.
I think MU is more interested in getting Mason Mount. it was even rumored that Mason Mount himself wanted to move to MU. unfortunately when MU submitted 3 bids to Chelsea and all were rejected. but if Arsenal is involved in these negotiations, I think MU may have to step down.