Yeah, having a front '6' doesn't appeal to me or most SEC coaches. 4-3 = tried and true.
The whole idea of the 3-3-5 is to have 8 men threatening the box. Against sets like we saw from LSU and bammer, it would be an 8 man box, not 6. The basic premise of the defense is to bring pressure from lots of different positions, confusing OL assignments. Even when you only bring 4, they never know who that 4th one is.
The Spurs (the guys that play the hybrid Safety/OLB position in the 3-3-5) would have to be absolute studs, able to tackle like a LB, and play coverage like a nickle back. If they can't, then you're screwed. So, for instance Lemonier would be relegated to playing head up an OT, and playing more like a DT than a pass rushing DE because you can't ask him to cover a WR. Bates would be the closest thing we had to a spur.
It's a risk vs reward defense, that will give up big plays, but hopes that they're more offset by the negative plays it causes due to confused blocking schemes. Also, a good OC can use formations to put your spurs in a bind and force them to be cover guys only then run to that side to take advantage of the weakness, or force the DC to have to bring the FS down to cover a man so the spurs can play closer to the box. They can also formation you out of the 3-3 stack, and that hurts the slanting and blitzing aspect that is the base of the defense. The DL and LBs are constantly slanting and blitzing. If you guess wrong on where to bring the pressure from, you essentially eliminate the LB you blitzed from the play.
I don't like it. It's so far and away different from what Chiz does, I can't see him going this route.