Longar Longar is a great example of a player who got screwed on the redshirt... and it hurt the program a few years later. He barely played as a freshman, but didn't redshirt. Turned into a very solid player as a junior and senior, played with Blake Griffin as a senior and was the 2nd leading scorer, 2nd leading rebounder, leader in blocks, etc.
If he had redshirted he would have been able to play one more year with Blake on the 30 win team, and who knows what would have happened with Longar playing next to Blake that year. OU would have been better, I can tell you that.