Personally I think this deal would answer a lot of problems.
The right age - he wont get in the way of Garcia or bellis progression. Also we have a young defence. Stones laporte mendy angelino all need a leader and experience and nico doesnt offer that as well as he isn't good enough (now).
Physicality - he possesses speed, strength and height. Again we lack these attributes so partnered with stones or laporte is the perfect blend.
If we spend 70/80m on him in Jan and sell nico that defense is sorted for years. Angelino mendy(when he gets his game back after a horrible 2 years) is set. Cancelo and walker are strong rbs. Walker is the only player reaching 30. Stones laporte koulibaly is strong as hell for 3/4 years then its peak stones laporte with garcia and bellis. I understand it's a lot of money but we need a new leader at the back to replace vinny.