Diego León

At this stage Amass is well ahead. The questions on Amass are mainly projections about how well (or badly) his small size and average speed would translate into senior football.
His body of work so far has been very good unlike Diego.
Is Diego playing for the under 21s? Where do you see him play currently
 
Lack of confidence, poor passing, too raw?

Poor positioning, poor decision making, rushing into challenges and being beaten with subtle movements and then left for dead, poor recovery pace..........

He looks overweight/bulky and even though he has decent top speed his initial acceleration is slow.
 
He just doesn't look like a particularly good player. He's not that young either. It was worth a shot, of course. You win some, you lose some. Hopefully, we can get something for him eventually.