Serious question... have we cut Byrd? I saw a report a couple weeks ago that said we had informed him that we'd cut him, but I haven't seen anything that said we cut him.
As for the thread topic: IIRC we began running the 3 safety set to get the best players on the field which was KV, Jenkins and Bush at the time. As enticing as the formation is I don't believe it has been successful. Bringing in better LBs and CBs could spell the end of it.