I think his form on any shot is simply inconsistent. Jumpers are excusable because of the many factors involved (defense, range, balance, etc.), but to be not only a poor FT-shooter, but a downright awful one is inexcusable.
He doesn't have to turn into Ray at the stripe, but get to 70% to keep the defenses honest knowing there is a chance he can hit them both. Everyone is now more surprised at him making both than making none, and that is sad for anyone, let alone a guard.
I hope he worked on it and I want to believe he did, but we won't know until the season starts. Him confident at the line will open up his penetration because he was clearly unwilling to take contact last year because of his struggles at the line.
His goal this year should be 8 FTA/g.