Wouldn't be a bad signing if 2 midfielders leave in the summer (including Silva) otherwise it would be fairly pointless. He operates in a similar role to Gundogan from what I've seen from him, he's just more mobile and would tick the homegrown quota.
If we can flog Gundogan I reckon it would be a good signing as someone to play alongside Rodri, occupying a deeper role. If Gundogan sticks around, I just don't see where he fits in personally and think it will be a bit of a waste and again cause unecessary selection headaches like we had on the wing with Sterling/Bernardo/Mahrez/Sane all vying for 2 spots.
KDB, Foden, Bernardo, Winks and Rodri for the midfield roles would work. Add Gundogan into the equation and it's just overkill and would leave someone unhappy, which would likely be Foden and would also be the nail in the coffin for academy players like Doyle to ever get some serious game time.
I'd love for someone like AC Milan to come in and offer us a decent sum for Gundo and test his resolve for a move. I just don't think he'll ever truly fit this team, as much as Pep seems to love him and it would be best he moves on.