I agree with you, last season Chelseas's squad was a mess, they had more than enough players... Sometimes having too many players in a team can cause a headache for a coach, trying to find a stable line up and also make a lot of people happy.. So what Chelsea is doing this season is offloading there excess weight and bringing in the very little required players that they feel is needed!!! And i feel (WE) Chelsea are doing just the right thing and we dont really have to outdo ourself this season!!!
Picking players is very important for every club and yes I think Chelsea need to look at old players who are in the same position to let go in case those same positions have more players. But apart from that, Chelsea itself also needs to bring in several new players to be placed on several lines so that Chelsea can return to having strength like other teams in the Premier League. Because next season Chelsea fans are eagerly expecting more significant changes at the club.