Again .... Our defence is poor at best ... we need a defender like Bonucci who can play alongside Pique or even in between Pique and Umtiti in a three . At worst Umtiti could play in the less important league and cup games - he's still learning after all .
So after a fantastic 1st season, where he overtook Mascherano sooner than expected and started to play regularly in La Liga and CL (and kicked ass every step of the way), you want for Umtiti to be downgraded back to 'less important and Cup games', while spending another 50 mil in a summer where we desperately need a new RB and CM.
And this has nothing to do with Bonucci, he's pure class. But the only way this transfer would actually make sense, if we give up on a RB altogether, buy Bonucci instead and start playing 3-4-3 diamond exclusively (in that case we might as well sell Alba to United as well and get an extra 50 mil right there and go after Dembele this summer already). Not the worst idea actually, but almost certainly won't happen.