I haven't watched a ton of him, would he be an upgrade on Gundogan in the pivot role assuming Ilkay is fit? They have similar bodytypes; it would seem to be somewhat duplicitive, especially because we have Danilo to cover right back.
He's not better than Gundogan, but by the end of the season he might be better than 35 year old Yaya and 33 year old Fernandinho, and if those two do go downhill then we're relying on Gundo's fitness.
Plus the fullback cover would be nice. We do have Danilo, but 3 Fullbacks is the bare minimum really.