Jokes aside, I think having a strong quality depth is important as well. Not all managers like too many players though, like pep for example, but I guess for a manager like Maresca, he absolutely likes having enough squad for rotation, and it's good to see that the Chelsea board can give him. Morever, they are good at balancing their books.
Isn't Pep the squad depth master? He literally has 2-3 quality players in every position in his team and switches formation and players for fun every game, the only reason they looked so bad last season was ldue to injuries. No one likes a big squad more than Pep.
I read about the Jackson and Chelsea situation, he deserves better after how he got treated the whole season after the WCC. They didn't want him yesterday and all of a sudden they want him back to the squad same way they did to Trevor after injuries struck them last season. Is he still at Munich?