MT, I understood that VJ was going to be an UFA until the owners backed out of the current CBA. By doing this the poison pill changes took place including requiring an extra year of service to become an UFA. If that is correct, I would be shocked if the NFLPA did not require the number of years before acquiring UFA status return to the number in the previous CBA. That is the reason several of the players you mentioned are sitting out - up to the owner's backing out of the CBA, they would have been UFA.
Yes, but it's not just about the number of years. There's also a (sensible) provision in the current CBA, which might be retained in the next one, that says a restricted free agent can't become unrestricted by sitting out the whole year. If a team has RFA rights to a player by virtue of making a qualifying tender, it doesn't lose those rights just because its offer is rejected. That provision isn't tied to any particular number of years of accrued service. So even if the next CBA requires only four years to become an unrestricted free agent, it still could very easily say that no matter how many years you have, if you're an RFA in year N, you'll still be an RFA in year N+1 if you sit out the whole year.
It's a good provision because without it, more players would have an incentive to sit out, which benefits nobody. And teams would not get the benefit of their RFA rights. If there's going to be such a thing as restricted free agency going forward, and I suspect there will be, it has to work in such a way that it actually means something, and doesn't simply encourage players to sit out a year whenever they become an RFA.
It's possible that a one-time exception would be carved out for Jackson, McNeill, and Mankins. But I wouldn't count on it if I were their agents.