I'm curious - what's your thinking behind this?
The Nara clan as a whole seems, more than most, to be highly pragmatic -- see immediate analysis and jumping at the chance to ally with Jiraiya's new clan. When dealing with existential threats (such as civil war), on a mathematical basis even the, say, .5% chance that Nikkou would not think through the results of her actions and tells her clan, or worse, anyone else about Kagome attempting to murder her it could well lead to a civil war. In fact, he could use the same technique that Shikamaru taught her.
Now, there's no guarantee that Jiraiya spoke to him about it -- frankly, I would ascribe it 15% odds unless Jiraiya was
really uncertain about what to do about it, so perhaps I was overselling my statement before -- but if he did, I think it would be quite likely that would be Shikaku's recommendation.
As regarding my thoughts toward Jiraiya... I don't know his personality or leadership style well enough to say for sure whether he'd do so of his own volition. I'm having to constantly tell myself "No, the way Jiraiya outwardly acted in his office was not necessarily indicative of his thought processes"-- which is actually where this line of thought began. If it
were indicative of his thought processes,
and this was a Leaf-ascribed hit, then
something would have needed to change his mind or get word on what happened.
e: [The following paragraph refers to Shikaku and Hazou]
Now, what
else would he recommend? That I'm less sure about, in part because of my biases in favor of Team Uplfit -- it's obvious by now that Hazou represents both a major risk, while untrained, and a major boon, in what he can provide, and harming any of the rest of Team Uplift could lead to... divided loyalties. On the other hand, he's already
provided Leaf a major boon, so... dunno.