I didn't think Pozo was good enough full stop to ever make it in our first team, but if you're referring to him being played during our injury crisis last season, i'm not sure what options there were at the time in the EDS other than him. Kelechi had gotten a serious injury. If there were other players who should've been given that chance in front of him then I'm not aware of them. In terms of whether it did him considerable harm or not, again I don't know, but I do know that I didn't think he was good enough play in the first team and he has subsequently been sold so that suggests the powers that be felt that way too.
Jordi Hiwula should have played, said it at the time and believe it now. The fact that he wasn't was because he was Spanish and cost money, where as Jordi was local and cost nothing. If you think that is wrong then the only explanation is that Pellegrini rated Pozo better than Hiwula which is a ridiculous decision on another level.