"Dunbar would have done just fine as our talent level began to catch up." Can I please see your crystal ball?
"We still need to run the spread to get the recruits." Hasn't Brewster said we will continue to run the spread numerous times in recent weeks?
"If Davis becomes OC it will be a disaster, we will lose out on all the best talent." I don't have a clue if Davis would be a disaster or not, but how would that lead to our missing out on the best talent?
That Texas spread is totally different than the Purdue spread - that would be called talent! Purdue's spread has worked pretty well in the past with the right talent in place.
All that being said, I agree with you that we need to keep the spread. However, I'm not as confident as you that Dunbar had any willingness to be flexible with it at all.