Not full starters to the 1st team no, but a prolonged cup run wouldn't of harmed would it? Or in your opioion as Pep's closest confidant in all tactics and policies am I wrong again?
I've simply given you the fact of how old, on average, Guardiola's debutants were. Most only ever played 1 or 2 games, and most were in meaningless cup or league games.
But they were still much older than the 3 players mentioned were when Mancini left. So if you're expecting Pep to bring through a ton of 17,18 year olds then, well, history wouldn't suggest its going to happen.