yes the new deal is griezmann in, costa and filipe luis out. for some reason chelsea balance the books, it's strange but last year saw romelu, luiz, and a lot of loans, and they got some big players but they aren't like real madrid or man united just spending frivolus money. i think they spend a lot buying the young players to groom and sell, so that's where a lot of the TV money goes.
good question matt, in my rudimentary analysis it just seems they are pretty balanced in transfers. i could be totally wrong.