Yeah i dont really agree with this, I mean there is a difference there in their current levels but you really make it seem like they are worlds apart when I dont think so. I just think TAA has benefited a lot from being in a much better side. Lets be honest, TAA isn't exactly the best defensively and all his praise seems to come from his attacking ability.
And as far as games go, he was very good in that A**x game and he also pocketed Zaha in that palace game early in the season I think. Wasn't he also playing in a game against liverpool early on and had Salah in his pocket as well? Im sure I could find more examples of good performances, but people seem to remember his more recent ones which in general have been pretty sub par.
But yeah, hes only 20, and can should definitely improve so im not overly worried about him. As long as he stays injury free and gets good game time and experience, its only onwards and upwards