Noumero
Omit Needless Words
Right now Jiraiya can't do anything which would be interpreted as him stopping Zabuza from revealing the conspiracy, since the very act would reveal him as part of this conspiracy. He needs a different excuse, and is apparently failing to come up with one.We're the Hokage's adopted son and clan heir, how are we deniable assets? What we do speaks for the Goketsu and for Konoha, like it or not.
We have that excuse: we're really passionate about international peace, we're known to be undiplomatic about our passions courtesy of Hazou's tournament speech, and Zabuza is trying to cause trouble. If we do this convincingly, our actions wouldn't be seen as an extension of Jiraiya's: just an impolitik radical being impolitik. It wouldn't paint us/Gouketsu/Leaf in the best light, but it'd certainly be better than the alternative.