Wow this card looks awesome (if the rumormill is true). Kang's first fight in 2008 against Mousasi (whom I'd never heard of prior to this but he's sitting on an awful pretty record).
Anyway, as for the poll... I voted for Trigg because I think he his the obvious stand-up advantage, he has plenty of experience against top-notch grapplers (Dewees, Miller, Hallman) and knows how to avoid the submissions, the question will be whether he takes down Jacare or vice-versa. I think Twinkle-toes is going to be able to setup a shot better with his striking (and therefore finish via GnP) and is less likely to be taken down by Jacare.
Although, if I had to bet on Trigg losing, I'd pick by RNC too.
The three fighters you named have absolutely nothing on Jacare's BJJ. Jacare is no slouch on his feat either, for being a new talent in the MMA world. I got my boy Jacare.