It’s not an idea you can’t have a team full of 18 year olds with no experience thrown them into the premier league and expect them to thrive, it’s ridiculous to even suggest it. Like you say you can bring a few into the squad and blend them in but not rely on them to be key players. You might get a one off like Livermento who already had a man’s physique but the rest looked exactly what they were, boys playing men’s football.