Honestly, if you really care about it this much, you really ought to do your own ****ed research. Go look through the NCAA Div 1 Manual. You're looking for Section 126.96.36.199.The only question for the comparison between Kessel and (for one example) Obasih is whether taking a year off to go to the Olympics is or should be considered "beyond the athlete's control", etc.
It's OK with me if it is. But I'll ask again: can you name one other athlete for whom taking off an Olympic year turned into a sixth year of eligibility? As far as I know, Kessel is not only a rare case, but may well be a unique one. If there are others, I'd love to hear about them.
As for examples, I've found some in wrestling:
Dustin Kilgore of Kent State: Redshirted in 2007-08, competed in 2008-09, 2009-10 & 2010-11. Took an Olympic redshirt for 2011-12. Competed in 2012-13. No injury involved at any stage.
Jake Kettler: Redshirted at Minnesota in 2009-10. Competed at Minnesota in 2010-11. Transferred to George Mason and took anOlympic redshirt in 2011-12. Competed at GMU in 2012-13, 2013-14, & 2014-15.
Tyler Graff (Oh, hey, look, he was a Badger!): Redshirted in 2008-09. Competed in 2009-10 & 2010-11. Took an Olympic redshirt in 2011-12. Competed in 2012-13 & 2013-14
If you're really curious, you can find a list of wrestlers for whom this applied over the 2012 Olympics here, although at least one of them (Jake Deitchler of Minnesota) never finished his eligibility because concussions ended his career.
So, all that your complaining really demonstrates is that you preferred whining to doing even a little bit of research. As I said, pathos.