I think if making it was purely based upon talent then Esse would already have made it. If he can mature and adapt then he's fine....but he wouldn't be the first player who wasted their potential because of the requirements outside of talent.
Both Imray and Ozoh are interesting figures. I see both being sold or released but they are clearly already proven professionals.
Rak-Sakyi, more than anybody else is the one that should have made it in our side, but for whatever reason didn't.....Difficult and sullen? Don't know, but clearly talented.