I think they should increase Raiton potency a bit more so the potency is worth clipping into GCD. Right now it's nearly always better to use Fuma, making Raiton a bit pointless. If they increased it's damage or gave it a lasting DoT or something that would be cool. As much as I like the Ninjutsu mechanic, I wonder if they might simplify the skill a bit more, though I suppose it's supposed to be a surrogate for casting time like Iaijutsu is.