You can call it untapped talent.
You can call it more unknowns.
You can call it higher ceiling.
You can call it high risk.
Saying because he has never been "elite" so never received proper coaching, extensive looks, high competition etc is an abnormality not a positive. Sometimes there is a reason a guy plays at the top HS, then goes to all the elite camps, then is recruited as the #1 player in the nation etc. Because they have obvious talent. A guy like Allen can either not have the obvious talent, have some flaws that scare people off or who knows what. But it generally should not be viewed as a positive. That is just convincing yourself.