You've been doing a fantastic job of articulating your arguments,so I thought I'd help you on this one.
There was no grand change over to zone blocking.Perhaps they used it more in the later part of season,but to say the Browns where predominately a zone blocking team would be false.
They ran alot of traps and countertreys.Most of Harrison's big runs where off of those types of plays.
BTW,Hadnot surprised me with his trap blocking,I would have figured it to be Stieny doing the traping.I'm disappointed he was let go.