I was actually thinking about SLASH/BUST last night as I was having fun messing around and thought the rage suicide move was a bit different? It doesn't feel that useful in comparison to the weapon flip, but didn't play around too much. I couldn't remember for sure whether he played more like the SLASH moveset (I really didn't play him much as liked Sogetsu more), but was pretty sure it was. His SSM is an awesome throwback, but wasn't that for the BUST? I'd have to look back.
I wonder if they are contemplating bringing the different movesets back at all, and if so would they wait for a full sequel or push through in an update? Also wonder if they would even keep the US wording or move to the JP 'Chivalry/Treachery.' They tease Amakusa at the endings, I am kind of thinking he would be saved for a sequel but they have been good with updating so far...can see S2 being pretty good. I at least expect a better character select screen.
Overall just really hope they can pull off all the things they are planning with the game. No one is thrilled a Stadia version is pushing out the Switch/Steam versions, but hopefully it was a decent moneyhat that can be put back into the game.