I for one, actually share his concerns. He was brilliant mid season for Dortmund, but came back from lockdown slightly overweight and totally out of form, and he does not look to have picked much up on it lately either. Right now, I´m not even sure who I would like to see starting for United - Sancho or Greenwood. Dortmund sporting director has also been out in the media criticising Sancho´s attitude and his lack of understanding how it is to live like a top athlete.
So I thing it is a timely question if we should spend the whole transfer budget on him, or let him prove himself worth the money for another season in Germany. For pretty much the same kind of money, we could e.g. get Upamecano+Reguilon+Sørloth. We haven´t been linked much with the latter, but just wait for it...