What if they just got rid of grease lightening and the MNK ability was a passive that makes their GCD 1.5 permanently or what ever it is at GL4 then they balanced all the ability dmg around it so now you use Tornado kick etc. in the main rotation and do the positionals. I played Mnk to 74 and gave up what annoyed me was trying to keep grease lightening up I find it to be an annoying mechanic.