I agree with RAPTURE, but I suspect Mangini will use a lot of rotation in the LB corp, with only Vilma being an every down LB. I think Barton is next in line for most D snaps amoung the LB's.
It's also not set in stone that the Jets will supply the NFL with a depth chart that shows a 3-4 alignment. Like Saban did with Miami, Mangini may use the 4-3 as the base defense in the depth chart he sends to the NFL, which, in turn, will show up at NFL.com. The Jets will still run some 4-3, I'm sure of that, but how much is the question. Ellis will get almost every snap as a DE, but his FF value will jump up or down, based on how much 3-4 the Jets use. If the Jets use a 4-3 depth chart, Bryan Thomas' value will go way up, as a rush LB/DE, because he would be listed as a DE, not an LB.
Mangini is big on using players in a rotation, especially on defense. He wants fresh legs on defense in the 4th quarter.
Rovers, I like your addition of Bryan Thomas. Bryan Thomas is going to be playing the OLB (weakside) position with added responsibilites of playing some DE. I think he could possess very good value as a sleeper pick in the later rounds. RAPTURE
It all depends on the depth chart! That's what drives me nuts! If he's listed as an OLB.... well, his fantasy value is in the can. If he gets listed as a DE, he's quite possibly top ten. I'm sure the Jets will run both alignments, but way too many people think Mangini will run the 3-4 exclusively. That's a mistake. I'm not suggesting any talent comparison, but I see Bryan Thomas being used much the same way Jason Taylor gets used in Miami by Saban.Mangini isn't about the 3-4 as much as he wants to be versatile. He wants to confuse the offense, and be hard to game plan against. He wants to avoid predictabilty. I've seen Bellichick run a 1-6, 2-5, 3-4, 4-3, 5-2. Pennington never knew what the Patriots would throw at him. He'd call an audable based on what he saw, and then on next look, it wasn't a 3-4, it was a 4-3, with the DE lined up WAY outside. Then, that DE might drop into coverage instead.
Other than the DB's and Vilma, I would not draft any Jets IDP at least at this point in time. But, TC is now less than 3 weeks away!

I plan on attending at least 10 times this year. Even with that, it might not mean much.... I'm sure Mangini will spend a lot of time teaching the 3-4, which will likely fuel the idea that is what he'll run almost all the time. In any case, I'll offer my TC observations up here anyways.