Don't think you can really compare Morata's situation at Real with Sanches' at Bayern. The former had proven that he can perform and score goals but he just wasn't favored by Zidane, who preferred to play Benzema upfront. With Sanches, he has the potential to be one of the best midfielders but right now, he hasn't done anything to suggest he'll immediately displace Kante, Bakayoko and even Fabregas. I practically watched all the Bayern games last season and whenever Sanches played, he underwhelmed and did nothing like the complete midfield you're suggesting there.