So it's the "strongest" because:
-It can target multiple units with its arms
-It has a useful active(ink spray)
-Its downsides can be mitigated with a single spell and turned into huge-ass reach
-It can grapple. With +2 STR.
Thanks for the explanation at the beginning. I had no clue what those XDY statements were. Though I still have no clue, how they're supposed to work in universe, I don't think I've ever seen a die to be rolled in this manga.