Personally I can't see Kelly finally breaking through this year. He has some talent and some unique qualities. But can't seem to improve on his weaknesses.
His lacks body strength, quite a lot of it actually. Kelly should just hit the gym and build muscle all summer. Not just this year, but the prior years as well. I'm not saying he didn't do this because I wasn't there but if he did, it didn't seem to work.
And now, with his shoulder injury, building muscle mass is probably even harder, so I don't expect sudden improvements in that regard. So I think Kelly will just be Kelly.
Making some threes, hesitating on others. Traveling a couple of times with those pump fakes, but getting to the rim some times as well. Over passing a little, but making some great plays for others as well.
Just KO being KO. A nice complementary player who is great at times and awful at other times. Just play him when he has it going and limit his minutes when he is bad.