I just don't buy that. Correlation is not causation.
Len's minutes are limited by fouls and terrible play. In games where he wasn't playing like absolute trash he got to play more, in games where he did play like garbage he'd find himself playing less, same thing is happening in Atlanta. Len had a lot of games of like 15 minutes and virtually no production, stats like 2 points and 1 board (his 3 games earlier last week were actually BELOW those numbers), you just can't keep him in the game when he's getting obliterated.
Len's production isn't getting limited by a lack of playing time; no, his often terrible production limits his minutes.
Furthermore, while he has added range to his game, his shooting percentages have tanked and the added range hasn't done anything to aid his efficiency... also, his lurking around the 3pt line has made his rebounding rate plummet, and rebounding was pretty much the only thing he didn't suck at.
He's just not a good player.