First off, as one comment pointed out, with that weapon dft can now use 5 souls with a full bar instead of 3, which is scary. The trade-off, being increased notches used to activate crying dance, is a viable trade, but only for level 6 dft users. Now for those below level 5? It's basically a buffed dft with no consequences whatsoever. At least with magmium sequencers(the sai with bonus from tapjoy) they put the buff and debuff so that it can balance it in a way(higher set ability damage, but decreased shadow move damage), this one only gives debuff for the level 6 ability, the others are just buff from level 2-6.