Yeah. Cesc is not exactly the type of player Mourinho likes or else he wouldnt have sold Mata. Pogba and Koke suits his tactics more.
Indeed, they do suit his tactics more but I wouldn't really say that Cesc and Mata are similar kind of players. Cesc did after all play in a 2-man midfield when the Premier League was a lot more physical back in the days.
I'm not a fan of using defensive stats but these stats are actually great and worth posting to prove a point;
Cesc's defensive stats from 2009/2010 - 2,3 tackles per game and 2,3 interceptions per game.
He's lost some mobility but I still think he could handle the defensive side of the game even if he would have to play in central midfield.
Anyway, I don't think he's going to Chelsea. Would be a poor choice for him because I believe he would struggle in Chelsea's more rigid set-up.