older perimeter players typically break down as they age and lose the speed that once allowed them to play good defense. Bron... hasnt lost anything physically. His athleticism is still top tier, but he just saves it all for offense and flat doesnt hustle on D.
LeBron may still be more athletic than everyone else but he’s definitely not 2009 LeBron.
If guards (or perimeter players) are getting more defensive rebounds than ever before (and def rebound %'s have increased) and offensive rebounds are declining sharply, then the obvious conclusion here is that guards are getting more rebounds.
Or to copy/paste from this article: http://www.nba.com/article/2017/04/0...ounding-trends
"According to SportVU, over the last three seasons, guards have accounted for 35 percent of defensive rebounds off 3-point shots and 31 percent of defensive rebounds off 2-point shots. So as the league shoots more threes, guards grab more rebounds."
Probably has something to do with pretty much every big taking 3's now a days, which lets the smaller guys run into the paint and grab the rebounds.