Totally the right call and worth the risk for 15 yards of field position. The only other thing I'd have thought about doing is possibly squibbing the ball down the middle of the field and hoping to get some funky bounces and either get a recovery or pin them inside the 25. I'm just happy he didnt drill the ball through the back of the endzone like almost all coaches always do and not take advantage of a penalty.
But you guys can play armchair QB all you want. If he squibs it, and it bounces out of bounds, you guys would be crying that Baxa has never done that either. Guess what? He's a true freshman and it's game 7. He hasn't had the opportunity to do anything other than kick deep. But again, it literally didn't matter. Miami still got the 3 and out stop they needed in about 20 seconds. But you had an undisciplined moron get smacked with a dumbass penalty. Take advantage of the 15 yard penalty they gifted you. The rate for onside kick success is about 20%. That's easily worth a 15 yard risk.
Again, from the 35, it's the wrong call. From the 50, it's the right call. Just didn't work out. Blame the guy for the 75 other things he did that blew the game...the onsides call was not one of those things.