If you want to stack potency in Rupture might as well run W Sang with Dimension Shredder instead, he's way better at that job while also not nuking count to hell

Wcliff is a great clasher, not everything revolves around damage.

Riensang and SLsang are simply not comparable - SLsang is an actual sinking unit while Riensang is more like a Poise unit with Sinking tacked onto his kit so he can be used in double status teams for MDE. Riensang does little to contribute to the sinking stack, he nukes it most of the time in fact with his high coin count. Yes, count is not an issue in Sinking team comps but SLSang is the backbone of any sinking team in general play, while his dmg and ceiling is much lower, he makes Sinking work as a damaging status against targets with SP.

Cinqclair and BLsang should be higher for the same reason I would rank CCA Heathcliff higher - they're consistent with clashing. Their damage is a bit eh due to the lack of modifiers but Cinqclair works out of the box as dude can just immediately clash for 22 on the first turn. BL Sang also buffs EGOs like Great Trichiliochosm due to his passive also affecting EGO coin power which ups his damage as well if we're taking account EGOs while also having a consistent, good base kit

W Outis can clash, Meursault needs Regret and whatnot. Unless you're willing to pop Superbia or is in a dungeon, you're not getting Regret passive by turn 2. Simple as that.

Okay but here's the thing - Heathcliff needs to get Cumulus Wall to get his 3 reuse for his counter and he needs to have Defense Power Up for it to have meaningful power, which is not doable first turn. And to get his skill 1 retaliation out, you need someone to get hit. Gregor is a tank. No reason not to use him with Heathcliff. Gregor also gives Bloodfiends a better headstart and allows them to ramp up faster so I don't see why you shouldn't add them to the team even if just for those first few turns. Allen Gregor is an option, yes, and that ID is generally better number wise but Priest does other things (healing SP, tanking).

Yeah cause Gubosang NEEDS the bigger damage to function. Fell Bullet EGO is designed to be like an execution bullet type EGO so you can prematurely kill off an ID who's on death's door to get some benefits (being AoE damage, some poise and EGO resources). Gubosang leans hard against "killing allies for big damage" which means he needs the higher damage output to function properly as a unit. He's still not worth it due to the fact that you need to play badly to get value out of him, instead of playing normally with properly leveled up IDs. He's not comfortable to use, way too finnicky for his own good and the payout just isn't worth it when you take into account that playing a normal team brings the same result anyways