I'd trade Judon for Darrisaw in a heartbeat, but Minny won't do that and Tampa won't trade Wirfs. They're not trading a starting tackle in their prime for a 32 year old OLB. Neither team is hard up for cap space, why would they? They could extend both these players and trade a later round pick for Judon and afford them both. The only way this happens is if these players want out.
The Patriots are probably allowing both Judon's and Godchaux's agents to sniff around to see what they could get in a contract after a trade, this late in the season and given both players age they might find there isn't a lot of money out there to be had, then they'll have to crawl back and take the Pat's offer which should be the best. Currently the Patriots rank #1 in the entire in cap space, according to OTC they sit 44 million dollars above the cap, the next four teams average 34-37 million... they have cap space coming out their ears.