For sure his injury derailed his future potential, but even at youth level, where he impressed, I always thought he looked good because he was physically better than his opponents.I'd have sworn blind we'd sold Thierry Ambrose. He always looked a real prospect before the end of 2015 when he did his knee(?), powerful and fast and always seemed to play with a smile on his face. He missed all of 2016 and the start of 2017 so hopefully he's over that and can carry on improving, he certainly wouldn't do you any harm. Looks like he's only got 12 months on his contract(he's 22 BTW) so if he does well for you you might have the chance to pick him up for training fees only.
Now that he his against adults, I think his decision making, and overall technique is showing to be very average.