Maybe I missed this, but do we know why Park took a personal leave? I thought all we knew was it was for personal health reasons (with some speculation maybe mental health). If that's the case, I completely don't understand the sentiment on here that he has to earn his spot back or prove his commitment to the team, or that his actions were in anyway negative. It's no different than if he couldn't play because he had pneumonia; that doesn't reflect negatively on him at all.
I think you play park when he's healthy, but I feel a lot better about Iowa State's QB position until then. Also, while Kempt was incredible, at least some of that needs to be attributed to Iowa State's play calling, Oklahoma's play calling, the fact that Oklahoma wasn't expecting him/weren't prepared for him, and the fact that there was less pressure since he was third string and Oklahoma was a 30 pt. favorite. Again, Kempt was incredible, and therefor I don't think you play Park until he's 100%, but once he's 100%, I think he should get the start