Harry Kane at 20 hardly pulled up any trees on loan and didn't convince Spurs he was a player until was was 22.
Amad was unlucky to get injured just prior to a proposed loan at Feyenoord in August 2021 and was deprived of the chance of men's football as a result.
His Rangers loan ceased to be viable the moment Celtic hammered them and Van Bronkhorst decided that the risk to his own skin was more important than the development of a 19 year old.
Given a manager prepared to develop him, Amad has improved in some way in every game for Sunderland.
In yesterday's game his stats for touches, passes, and passes completed were higher than anyone else on the team.
Tony Mowbray said of him in November ""Diallo's training has been unbelievable, how fast he is, how direct he is and how good he is with the ball. You look at his physical data in every match in the last three or four games, he's been the highest distance covered, the highest sprint distance covered, the highest high-intensity energy runs."
I'm not sure how a 20yr old player, in these circumstances, could be returning better performances to show he will be ready for the first team next season. All the issues he needed to address are being resolved with each game.