He is a good defender but he is on par with what we have.. I mean He might fight it out with Benatia and Rugani who IMO will be great but he needs more experience to get there, but I cant see Pique rising to the level of Chiellini (yeah I know they are two different kind of defenders..) (If you have trouble with that comparison replace Chiellini with Bonucci)
If we are to take a defender let it be of the very top like Hummels (Yes he is good dont start your he makes mistakes stuff) T.Silva or some kind of a Bonucci in the future kind of player
Besides is Pique going to be free next summer? We do have the policy of going for loans and free transfers...