Wow. Can't hit a 10 footer? I am not sure you watched him play this year. He will be just fine shooting the ball from 10-15 ft. And I think his free throws will be fine in a league where most guys suck at them. And jeff whithey is not even close to the best player he faced this year. Thomas Robinson, Anthony Davis, Drummond? He made them all look stupid at times. I will just be interested to See if he can keep his motor going 100% for an entire game. I think his biggest problem was coasting at times because he was so much better than everybody else in the gym.
I love Royce, but no, he does not consistently hit a 10-15 footer at an NBA level and Hoiberg would agree (NBA scouting reports disagree with you). I was talking about centers who are clogging the lane if he drives when his man double teams off of him. The guys you mentioned are comparable to guys who will be doubling off of Royce if/when they don't think he can hit an open shot. The guys clogging the lane will much more physical than Jeff Withey, Jeff Withey is an example of one of the least physical centers he will face. You don't even have to get up to the All Star or starter level. Omer Asik as a backup center is several times the defensive presence the best Big 12 center was.
Royce needs to be able to hit that shot if it's wide open and he's double teamed off of. I think he can, but he'll have to improve and HE knows it from listening to his interviews. That's his biggest challenge on offense. I'm not worried about him getting up to at least the high 60%s or even 70% in fts because you saw that improving as the year went on.
You clearly don't watch NBA ball if you think free throw shooting is WORSE in the pros. Guys who shoot 18% better than Royce have been intentionally fouled in the 3rd quarter just in the past few days. The shooting from the floor, 3 point line and at the foul line is on a completely different level.