I didn't leave out anything. My point is that if he went down after getting the first down, Minnesota has no chance of winning. With him scoring and them getting the ball back, they had a chance of winning, albeit a small chance.
Minnesota had a very small chance either way. If he takes the knee, Iowa could botch the clock or fumble a snap and Minnesota could get the ball back down 5. If he scores, then they have to score a TD quickly, get the onsides and then score another TD. Both scenarios were very unlikely. They scored way too fast after the Daniels TD, but then they still had to both recover the onside kick (they couldn't execute) and score another TD in limited time.
I said in my comment that the most optimal solution would have been to take the knee....but let's not pretend that both pathways to a loss weren't exceptionally unlikely and let's not pretend that taking the knee is a 100% guaranteed, no-risk guarantee of a win. Very, very low-risk, but not no-risk.