Doesn't EB have some violence towards women charges in his deep past? I'm not sure MB will be one to forgive in that area.
Petzing makes sense to me. He was the Vikings Asst. WR's coach when Gannon was the Asst. DB's coach. I bet they got really close over those 2 years.
Norv Turner was the OC back then and getting recruited to the Browns via Stefanski makes sense as well. Lots of play action. Lots of shot plays. Very little quarterback movement however so it will be something to watch out for.
I'd really love a Mike Zimmer in the background type hire as well. Maybe Asst. HC or something.
Petzing has done most of his work under Stefanski who credits Kubiak for teaching him a lot. As you say, lots of PA, lots of bootlegs in a Westcoast offense.
He'd probably be my choice from the names so far too.