James Young = younger than Rozier and Hunter.
No disrespect intended, but that is an argument that is still no more compelling/convincing now than it was the first 10 million times it was used.
It's true that
if all else is equal (talent level, skill level, motor, etc), then the younger of two players going to be the one with the higher potential.
The unfortunate part for Young is the part in bold because right now all is not equal - and when all is not equal, talent/skill/motor beats youth every time.
So far RJ Hunter, Terry Rozier and Jordan Mickey have all shown far greater talent, skill and motor than Young has, despite the fact that Young has the advantage of one year of NBA experience. As long as that continues to be the case, Young's status as a Celtic will continue to be threatened.
Sure Young might be the most qualified when it comes to teaching the vets about the latest electronic gadgets / social media techniques, but sadly that isn't enough to earn a spot on an NBA roster.
If he hasn't proven that he can contribute at an NBA level by mid-season, then there is a very real possibility that he might not survive the trade deadline...or that he might find himself permanently lost in the D-League.