Ertz has no business starting another game as KSU's QB, IMO. He's a banged up lame duck QB in the midst of a season where we're just hoping for a bowl game. Delton has played as good, if not better, than Ertz this year, and he'll have eligibility next year. He also doesn't appear to be as prone to injury as Ertz is at the moment.
If it were up to me, Delton plays the rest of the season with Thompson hopefully getting plenty of time against KU this week.