We didn't run a straight-up 3-3-5 all the time. There were plenty of 4 man fronts and tweaks in games. But Butler did spend a season with White here and he's been a DC before at Penn St. and has plenty of experience to run a defense if he does get the nod.
Besides, there aren't many coaches out there who HAVE run a 3-3-5. It's a pretty small tree. White learned it from Rocky Long. Leonhard mostly ran a 3-4 at Wisky and he's the big name people seem to want. You could argue that Butler might be better positioned to take over something he already has a year with and also knows the personnel.
In reality, most really good DC's could come in and pick up what Rhule wants to do and what we've done. I frankly don't care who it is . . . Rhule will pick a guy he thinks can do what he wants.