tm3308, there are at least two Hilgenbergs that would be centers before your choices.
You probably should have prefaced your team by saying you didn't know that many from the pre-Fry times. And Dr. Eddie Anderson could be on the coach's list too.
Tippett played DE at Iowa, by the way.
Jeremy Allen would probably be a better FB choice. There may be others before him, but none stand out and I know Iowa football back to the 1950s in many ways, thanks to my dad.
Karras wasn't an OT but a DT, unless he went both ways, which I don't believe he did.
Keaton Smiley and Merton Hanks probably need to be on the list at safety. But then Paul Krause and Emlen Tunnell are number one and two in the NFL in all-time INTs and both are in the Pro Football HOF. But Tunnell might not have played as much as one would think at Iowa. Someone can correct me if I am wrong on that note.
I'm sorry dude. I don't mean to seem like I was picking on you. But the Hilgenberg thing got me typing and then I just made the rest of the notes from seeing what I didn't like about your picks. But I am probably older than you, too, so it is to be expected that I came up with some names you might not have thought of.
Thanks for spurring me on to do a list, sort of. I don't think I would have posted otherwise. And I am glad I did, because it was a fun exercise.