The last time I remember speaking about Hana, I used the term 'infohazard protocols'. The issue isn't that Hana is more capable of messing things up for the team, though I'm far from sure that she isn't, as much as it is that she has many plausible motives that result in her trying to do so, whereas Zabuza has few. Hana has neither positioned herself as an ally (she's harmed more uplift members than Zabuza has), nor has she seemed to at all backtrack after Jiraiya's aggression, or when we raised concern. Not only this, but the same issues in the plan that caused the last disaster seem unfixed in the new one. If Hana has no motive to stop her actions, and the plan avoids doing anything to move in that direction, not only do you not fix the problem, but you provide more avenues for it and risk cementing the framing in Hazō's mind.
In terms of benefits, the Hana plan seems remarkably sparse on them. It doesn't work towards fixing any of the issues there, it doesn't move Hazō any closer to being able to safely trust Hana, and the conversations don't seem like they'll have any payoff.
For Zabuza, there are a bunch of positive payoffs. Eg: it's balsy, in the kind of ninja way that's good for PR; it's a significant progressive emotional step for the team; it's a high level connection with Mist of the sort that could plausibly link to power; it's the kind of thing that would appease Ami. The risks seem both minor and like the kind of risks that Jiraiya would catch, or that would lead to a veto by Noburi or Keiko.
@Vecht You're coming across as unpleasantly aggressive. I appreciate the concerns but this is a bad way to communicate them.