I agree Pons could easily be a 10 rebound per game guy. But, Rodman was special in how he could tell where the ball was coming off the rim and/or backboard, plus nobody was better than him at tipping the ball up when he couldn't get the board, keeping it alive until he could grab it. It's an innate ability/talent that not everyone has, which sets ups, me, talking about my Glory Days.
I was a beast rebounding, especially on the offensive glass, because I almost always knew where the ball was coming off the rim/backboard. My teammates used to say I would miss shots in the paint on purpose, so I could pad my rebound stats. The thing was, as soon as the ball left my hands, I knew whether I hit the shot or not and where to go to get the rebound. Like I said the really great rebounders have that feel, I don't think Pons has it, but he can make up for that with his athleticism, hops and using his ripped body for boxing out and positioning. Also, just the effort and will to go get the ball, more than your opponent, will add another couple of boards a game, imo. Plus, leaving his man to help and block shots sometimes puts him out of position for the board, but he is an elite shot blocker, so apparently Barnes can live with that, I know I can