Demin's background in particular is much higher level basketball than your typical HS recruit. And Catchings too, coming from OTE where he would have been playing more competitive ball against older guys than usual (and being coached by Fanning). They're likely going to be more accustomed than you'd expect with a lot of the concepts KY and staff are trying to instill in the team. Both are also no stranger to intense competition, they're not coming from a big fish small pond kind of background.
All of the above also goes for Bosko, but as far as I'm concerned he's a vet regardless of whether he gets classed as a freshman or not.