seems like it'd always be better to never have to refresh huton via ninjutsu in a 100% uptime fight then. for 2 armor crushes, you lose 80 potency compared to AE, but you get close to a full huton (60s), so in exchange for that, you can do a shuriken or a raiton, which is much more than 80 potency. with a warrior applying eye you could simply alternate AE/AC, then without a warrior, you can alternate DE/AC