I don't have a dog in this fight, I am fine with the coaches determining who is the best player to start, but I see it the same way as you. While Heck certainly played well v. Washington, he also wasn't facing a defense as good as say, OSU.
It's hard to make direct comparisons when they quality of the opponent varies so widely. That said, it was great to see a great IA rushing attack and balls being thrown downfield too.
I don't think either is going to wow anybody on a consistent basis. At Iowa it matters a lot more who can hit a wide open receiver on a check down. Based on just the last 2 games that clearly favors Hecklinski.
Neither guy has proven themselves as a runner. Gronowski was obviously great at it, but a so-so passer, though he did better with that down the stretch. My preference would always be to have someone who can do both, much like C.J. Beathard, when he was healthy.
I think most of the teams that advance in the CFP are teams that have guys that are good passers and capable chain moving running QB's when things break down.
I would prefer Hecklinski at this point in time, but not going to lose any sleep over it. And I fully expect Brown to start at Minnesota, because that's who Kirk has proven to be. We shall see I guess.