So we can't use a 3-4 on running downs, hence the word rotation? Keeping CJ and Kraken off the field in passing downs is suicidal. But that doesn't mean they have to play on running downs.
Besides, ask Mark Sanchez if Davis can get to the QB.
We can (and do) sprinkle in some 3-4 sets. But, we do not have the personnel to run it more than occasionally. We would be massively exposed.