Emery sent Archer out on loan and brought Duran in and kept him in the picture from day 1.
Duran is getting minutes now in very important games which shows Emery trusts him. Other youngsters are not being shown the same level of trust that he is, they've not been recalled or have been sent back out on loan (Archer, KKH etc.)
For me, he is more than capable physically (I'd argue he's already pretty much the best athlete at the club) and has shown enough in cameo's and his international apps to be in the picture for next season.
Of course he's going to say he's one for the future, he doesn't want to place pressure on a kid who's just turned 19 years old. But this kid looks to have the capacity to progress incredibly quickly, which is most likely the reason we paid £18m to snap him up.