The Zealots had apparently wanted him to instruct people to revolt against Rome and to refuse to pay taxes (a good way to get themselves slaughtered, which they eventually did anyway after his death. Instead he told them that none of their agenda mattered. It would be as though we promoted someone to get rid of Bush and instead he just said "give him whatever he asks for, since it's not important anyway". I would suspect someone like that of collaborating with Bush (sort of). Only in his case, he wasn't collaborating with anyone. To him it really didn't matter.

This resulted in the eventual betrayal by the zealots by way of Judas so they could install someone more to their liking (who would do what they told him to do).

Dissident is one way of putting it. Possibly more accurate would be "visiting dignitary." He really wasn't a zealot at all.

It does fit.