Sure, just like how Dyche saw OBrien in training and decided he's not good enough to get any time on the pitch. Just like how Moyes Mk. I saw Barkley make a mistake and instantly shipped him on loan and likely would've as well if it wasn't for Martinez. etc. etc.
Managers have favourites for sure and make mistakes with selection because of it too. Moyes has the bonus of being among the most "safety first" managers in the league, so yeah, Aznou or Dibling or anyone can pull up trees in training if they want to, they're getting game time almost never, as the other options have 'experience'. Case and point is Rohl, who was barely given a chance when available and it turned out he's quite alright in the end - sometimes a chance is what players need, not 4 min off the bench twice a season.