Jorginho is a great player, but he's not world class in the prime Fabregas mould who can completely control a game.
I'm always hesitant about system players. Jorignho is an extreme case - I have never encountered a player so dependant on 1 system to this extent. We have no real use for him outside of Sarri's very specific brand of football, but thankfully we do have the one coach who can replicate the one system that Jorginho flourishes in, so that either works or it doesn't, but, on paper, he has the conditions here to be great for Chelsea.