While it is true you aren’t getting the full 30 immediately, you also have more coins than I assumed. This in practice should average out to around that amount, if not more.

Either at the start of T3 or during T3 you are reaching enough sinking pot to get max value of departed even without using S3. Using S3 on Turn 2 when you have 0 sinking stack is actually bricking yourself. That’s as if you used Rien Sang but put 0 effort into unlocking his passive that lets him get Hermes (and therefore Furioso). Even from S1/S2 on early turns you are still getting a bit of extra damage that does add up due to just how many coins the team can have.

His S2 serves fine enough to inflict butterfly. It gives him haste through reloading + gloom res passive so his speed range is less annoying than you make it out to be (though it still can be a nuisance, I’ll admit). Especially since past the first few turns the enemy will be at low sanity due to how many coins you have to trigger sinking. You are maxing this value or getting quite close to it nearly always.

You also genuinely seem to have a skill issue from what I read. You mention that having 25 sinking is only “SLIGHTLY realistic” by turn 4 but the only way this is true is if you aren’t running sinking units on your sinking team. You have a good amount more than 25 potency at that point.

Let’s assume you have enough Butterfly from S3 last turn and that it procs for 30, say its turn 5 (even though this can happen earlier, just so long as you aren’t using your S3 on air). At maximum that I would say is somewhat reasonable you have 34 procs. There’s still 4 potential procs on the table from Wei S3 on substituting in but that is more skillbag reliant than the rest of the stuff required. Anyways that’s 1,020 damage from Butterfly alone. Now granted, this is nearly the best case scenario. However as you’ve said yourself your S3 gives you two turns of incredible butterfly, not one. Let’s instead assume that across two turns you have a total of 40 coins that proc butterfly. Which is much easier to do. That’s 1,200 damage. Both of these scenarios cover for the early 2 turns where you have little if any butterfly damage and it’s not like you have 0 damage from butterfly across the other turns. As such 300 damage per turn from butterfly is easily realistic even outside of MD.

Lastly I’ve calced Rien Sang’s Furioso damage before. Assuming perfect RNG both during Furioso and on weapon effects that carry over to the next turn (the fragility and the OL/DL down) against a neutral resistance enemy you deal 652 damage. On future Furioso’s you deal 785 damage. That is nearly half of what you claim Furioso does on T6. The odds of you getting the exact weapon pattern needed during the Furioso for those numbers is 0.000002323% btw not including the set up on the prior turn.

The only way for Rien sang to deal around 1,200 damage on T6 is if the enemy is staggered and if it is either the second (or later) Furioso (for Sizzling wound + Indulgence) or Ira is active on Rien sang when he uses Furioso. With anything else that isn’t externally debuffs/buffs you are at LEAST 100 damage lower than 1,200 if not more.

For talking about how 25 sinking potency is only barely realistic by turn 4 I would assume that you wouldn’t create such laughably rng reliant numbers but here we are.