I don't know those fans, and that's always such a fluff argument Indiana. The point being, there's not two co-DCs listed, there is one. Exactly like at UW.
To Sink's point, there are a lot of titles thrown out there to keep guys "moving up" and justifying salaries and/or guarantees (especially at state schools), but when MM made Chev a co-OC, it was clearly a demotion to Lindgren. Tosh's appointment wasn't like that, there was a vacancy to fill.
Saban has been keeping the DC job within the family. Saban owns that side of the ball. The last two guys are now head coaches at big jobs. He chose to promote (with both title and $$$) Tosh Lupoi as the next guy. Saban has the budget and cache to go get anyone in America. Because Saban has "his way" and is a DC guy, there should be no doubt that Saban does NOT hire some big name guy from a different system. He wants someone from within his defensive system, that is 100% up to speed on that system, who he feels can do the job. He picked Tosh.
So either he thinks a lot of Tosh or he had an empty rolodex of guys from his defensive system floating around who were available?