the problem of fan is that doesn't really matter much those 800 ninjutsu you gain when your stat is over 18k, but matters a lot the difference between owning 1500 more injury and not owning it with a very high stacked move 1 that more or less always crit on enemy move 2-3-4.

even for a healer like azure fang 800 more ninjutsu are just 280 more healings with regenerative healing jutsu (if healing tips is used) and 202 more healings on healing jutsu, both of them are wholly denied by ignition, so is better if your healer just endures better the damage with gourd and maybe increases a bit her chance to not be controlled.

So for shisui just use rope.