He's right. Rondo needs to grow up. It's discussed year after year, and not much changes. If seeing how much his teammates enjoy playing without him won't, nothing will.
Grow up how exactly? Never been in trouble off the court, doesn't throw Russell Westbrook like tantrums, or demand trades and quit like Chris Paul or get coaches fired and make them retire like deron Williams.
He's actually pretty poker faced and boring for his age
A 7 game sample size without him doesn't all of a sudden disprove the last 3 seasons of constant improvement and being one of the league's best point guards and playoff performers, sorry