Sanchez has every attribute possible to play as an attacking midfielder. He already does, albeit mostly from a wide position.
This is why Pep is such a visionary. He wanted Sterling at City when his potential was becoming apparent, but what has he said about Sterling's future? It will lie as a No 10, but he has to learn his trade first.
Please don't be offended when I say this, but when Pep thinks outside of the box & you others can't see his vision, it doesn't mean his vision will never be reality. It will, albeit you & several others cannot see this yet which is what separates Pep from our previous incumbent & other run of the mill PL managers.
For Pep's vision regarding Sterling's possibilities, see Sanchez.