I think it doesn't work that way.
Pep always says the players are in a competition for selection, in daily training. Nunes has to compete with Kev, Bernie, Phil and Mateo. It's not tricky for Pep, only for the players.
(But then at least there's rotation in a packed fixture list.)
I also see his confidence as the key point for Nunes' game, as I think he has all skills to be top class. But he's not like Kev who just follows his instincts, pulls the gun and fires - and doesn't care much for the risk.
Nunes is a bit shy, the final pass or finish don't come free and confident. But this confidence can only come from himself. He HAS to believe in himself. That will make the difference for his game and his career. No idea about sports psychologists being involved, it's still very secret nowadays, although everybody knows how important that is.
This is another example for the importance of players' personality as a key point for successful scouting. Good players there are plenty, but we want to find the winners...