I think one of the issues is that we generally only see the fringe players play the odd 10-20 mins here and there, and surprisingly enough they looks a bit rusty and not up to speed. In the event of a major injury it may take 2 or 3 games for the team and new player to adjust, but as a team the drop off wouldn't be much. Last year we lost Alisson for a large part of the early season and we won every game