Jaron Boone was pretty tall when he played PG for the Huskers. I believe he was 6'6.I was not aware of that.
Seems crazy in college to have a small forward (out of high school) playing point guard at 6'8", but if he is a great ball handler, athletic enough, good facilitator etc, it would be like LeBron taking the ball up the court.
I just looked up tall point guards...not as uncommon as I thought: Shaun Livingston 6'7", Penny Hardaway 6'7", and Magic Johnson 6'8".