I think it's a little too easy to try to compartmentalize who favors the offer and who doesn't. Of the guys I talked to, about 2/3 seemed to think it was an "OK" offer they seemed to be leaning towards voting for, and 1/3 were of the "hell no, that's not good enough" variety. There was no correlation between seniority and how well they received the offer. If anything, you'd expect the "junior" Captains to be "anti offer," since they'd been the ones most "screwed" by the previous contract, and the "senior" Captains to be the most likely to just "take the 20% and run," but that's not what I heard from the guys I asked. F/Os seemed about split 50/50, and that did seem to follow their seniority a bit, with the more junior F/Os receiving the offer more favorably.
I think there are too many different kinds of guys in the pilot group, with too many different personal goals, to predict how it will come out. In the end, everyone is going to vote for what they think will benefit their own situations the most anyway.