The "if he backed himself" line is just so stupid. People like you try and use it like some blanket term to write off anyone. Transfer target turns us down? Coward didn't back himself. Youth player sees he's getting no chances? Weak kid didn't back himself.
It doesn't actually mean anything, it's just a cop out excuse for when we get rejected.
The truth is Sancho did back himself. He knew he was ready for senior football at the top level, and he's gone out and proven it. Not only that, he backed himself to succeed despite moving to a foreign country on his own, and having to learn a new language along the way.
Not backing himself would have been sitting in the stands next to Brahim, picking up 30,000 a week waiting for a chance that may or may not come.