The free throw shooting was the one that always bothered me the most. I find it hard to accept that a professional basketball player, especially one who isn't a 7 foot tall center, can find a way to make at least 65 - 70% of their free throws.
This is why 2 - 3 years ago I advocated for trading Rondo for Rubio. Sure Rubio can't shoot either, but at least he doesn't have to be petrified to drive the lane and get fouled.
Oh well. Rajon was a great player for the Celtics, and also one with a good deal of "what could have been" associated with him as well. I wish him well in Sac.
It is a good point you make though. Some players continue to improve for many years into their professional careers whereas others are basically "what you see is what you get". Let's hope we are drafting guys with that hunger to develop.