True--Duany wasn't a natural 2. But he was the best 2 on that roster. And he played on the floor with three other players who predominated the ball -- Carmelo, GMac, and Edelin. The team didn't need him to handle the rock, break pressure, or initiate the offense. The ball was rarely in his hands. He was also a stud athlete who excelled at the top of the zone due to his length and lateral mobility. White is a good athlete, but his lateral mobility is questionable, and it will be hard for him to move his feet up top to stay in front of guards who put the ball on the floor. It just isn't a great fit, whereas he'd be a much better fit on the back line of the zone, where his size, strength, and rebounding would serve the team well.
Re: Gbinije--it was a four year process. He played PG nearly exclusively as a redshirt, as the team had nobody else, and they wanted a bigger player to match up with MCW in practice. Then, his sophomore year he played the majority of his minutes as a backup 1 to Ennis [yes, I know he also played some 2 and 3, but his primary role on that year's team was backup point]. He started at 3 for the majority of his junior year, but also served as the team's backup point guard, and even started there some games, playing lead guard whenever Joseph wasn't out there. And then he started last year at the 1.
So maybe it is more accurate to say that he had a 3 year ramp up building up to having to take the reins as the starting 1 last year, but on his four year career arc at SU, he played a lot of 1. And the grooming certainly began four years ago when he redshirted. It's not like he played 3 his whole career, and then JB abruptly decided to shift him to 1 for his senior season. He was a made-not-born PG, as a function of team need.