It’s probably already been said, but looks like Sancho might be another Dele Alli. The talent was there, the application and attitude might not be.
Or maybe Sancho just signed for the wrong club for a massive price. If you look at United signings of the past 10 years, there’s very few that you could say was actually successful and gone on to improve. Usually the opposite. There’s obviously something been happening there that’s making potentially good players go backwards.
But as we saw with Dele Alli, once you lose that dedication and motivation, it’s not easy to recapture it no matter how many new managers coming, or what moves you make to different clubs.
Some footballers are just purely dedicated to it, no matter how comfortable their situation is. But I can understand how some young players like Sancho could have one eye on wanting to dedicate themselves and get themselves back in a good position, and then one eye slightly on their bank balance and thinking “well how much does it matter anymore?” - I think it’s only human nature that this mentality will also appear in some players.