So... Hagakure was too much brain power...

On that matter, it puzzles me why Senei is like it'll be...
I mean, the 1250 potency is juicy and actually stronger than a Kaiten Midare, but did it have to be shared with Guren?
Wouldn't it have been nicer to just give Guren the 1250 potency on 1st target and a % less on 2nd and on and give Senei another non-recast shared usage? Like a "You deal more damage to the target you hit with this" kind of effect with some 500 potency or so.
Because if we think about it, a shared recast skill where the only difference is the potency and number of targets when they already have this "1st target gets hit for full amount and the rest for much less" thing working... isn't it like reselling something they already had and masking it as "new"? That seems kinda scammy :/