I don't like making excuses, but somebody made a good point on another site. It kinda sounds like he's having personal issues off the court. Check it out for yourself on twitter, but I just don't know why he's playing like this.
We're all in the struggle. Haha look at Kobe and all the public controversy he's been in, and all the clutch shots he has hit. As a pro and you gotta put that aside, especially when you're supposed to be the "go-to-guy".
He's got the skill and talent to be a go to guy, I don't see anything wrong thinking why he shouldn't or can't be one. Height is just another excuse. Allen Iverson was listed as 6'0" (Ty is listed as 5'11") and he was certainly a go to guy. If we want to get into history we can always point out hall of famer Calvin Murphy.