As a fellow Brown, Jaylen is my favorite player. Me and my brother call him Cousin Jaylen but his ball security is trash. No doubt about it. He needs to do the Luol Deng hand strengthening exercises with the bowls of rice.
This is why I've advocated for him to handle the ball more in the regular season. The regular season is practice time in the NBA. He should've been getting more touches to work on his handle and prepare him for moments like this, when Jayson doesn't have it.
He was ill-prepared to handle the ball more than he usually does. That is on the coaching. They have all the talent on the roster to forgive a few more Jaylen turnovers in some regular season games without worrying about losing ground in the standings. I think he'll be much better outside of Boston where he'll actually get an opportunity to handle the ball and improve his decision making. He'll be forced to elsewhere because Jayson is the man in Boston. And I'll still root for him like I did for Rondo and Avery.