The reason I consider Tavon Austin to be less of a player than, say, Antonio Brown, Rob Gronkowski, or Ezekiel Elliot, is that those players impact games every time they step on the field. It doesn't matter who they are playing or what the situation is. "They get theirs," so to speak.
Randy Moss used to tell his quarterbacks that he didn't care what the defensive coverage was on a given play; he wanted them to, "just throw it up."
Those types of players can impact games under any circumstance; they don't always have to have favorable conditions because they are that good.
Tavon isn't like that. His success is more dependent on situation, i.e., catching defenses off guard.
Larry Bird used to tell defenders, "I'm getting the ball over there. Then, I'm going to that spot over there, and I'm going to shoot a jump shot." Then, he would get the ball and knock down a contested three.
To use this basketball analogy for Austin, he would need to be wide open to make his shot, or, at least, for the defender to not know what he was going to do with the ball.
Players like Bird and Moss are the ones you give up draft picks to move up for, or to whom you pay tens of millions of dollars on multiyear contracts.