The 6 threes are a little weird because Portland insisted on guarding him with tons of space, essentially daring him to take what they viewed as a low-percentage shot. It's doubly weird to watch them repeatedly concede open 3s now -- it's not even a result of scrambled defensive rotations, they just watch him spot up and shoot.
I think I agree with you though. The fact that he had such a lovely midrange game suggests he'd have picked up the 3 if he tried. Plus that first step and the need to pack the paint to guard against those weird hanging double clutch layups, he would have had space to shoot too.
So I guess I'm making the tiresome argument that "your claim is probably right, but one specific bit of evidence is weak".