Think this is fair just because of how youth development goes. There's no real way to say for sure until a player is regularly in the first team - and even then, for example Davies looking like he'd be a world beater vs City and then never quite kicking on beyond that.
I'm very optimistic about Armstrong but the jump to prem level for a centre mid under the age of 20 is BIG. If he gets ~1500 minutes next season and looks 'okay' then things are going excellently.
