I think you might be on to something. Hard to blame him. This contract will be his last hurrah and he likely wants to land where there is a chance at success in the next few years before his career winds down. The Jets are not committed to winning in the near term - huge step back this year and lowest payroll. Looks a lot like a reboot / rebuild if / when Ladd and Buff go. Restart the clock, restart the D&D activity, could be another 5 years before there is another post season. Sorry but the players notice and talk about this stuff.
From this fan's perspective, I don't think it even makes sense to sign Ladd now. Buff, if you can keep the term reasonable, yes. Moderate overpay probably fine if you can keep him to 5 ish years. Ladd is more easily replaced than Buff. But honestly, I could see them both walking.
Maybe this is some kind of career ju-jitsu, where Ladd plays so poorly he'll be affordable by cap-pressed contenders? The way things are going he'll be signing a Jokinen deal in July. $4.5M x 2 with the Hawks?
Then Buff signs with Colorado and we'll still get to see them both a few times each season...