Sounds like nonsense to me. They can't possibly believe Dallas would give that. Or that Purcells would give up Ronnie Brown.
If they offered Roy + their #1 for MBIII, I'd be interested, but given that they'll have a top 3 or 5 pick, they'd be foolish to consider that.
The only thing that makes sense for Dallas is a draft pick, with maybe a 2nd or 3rd tier player.
Reality is, it's probably not going to happen, though if I were Detroit, I'd desperately be trying to get something done ASAP, whether it's with Dallas or not. It would seem to me he would have more value now than this offseason, provided they do it with enough time to get a new contract in place.