I actually mishandled the 'vs Self-Darkness' case, because I didn't consider you were still getting Tier 1 Aftermath, so it's actually more than that 72% lost because you still get a fair portion of ODD. A 300tp ODD may indeed not outweigh the Self-Darkness after all, so I'll include this factor while looking at 90 Redemption now:
90 Redemption: 136 base, 159 after fSTR
Quietus WSC factor: 1.566
Entropy WSC factor: 1.774
Quietus WS weight: 4.698
Entropy WS weight: 6.741, 7.406, 8.072 (100tp, 200tp, 300tp)
Losses: 2.043, 2.708, 3.374
100tp: 2.043 / 2.19 cycles * 1.2 per cycle = 77.7% loss of ODD gains.
300tp opener instead of Sekka Quietus -> Entropy and 100tp AF: (3.374 WS loss + 7.406 Darkness) / (6.57 cycles * 2.0 per - 2.19 cycles * 1.2 per) = 102.55%, meaning the self-SC and 100tp aftermath outweighs the 300tp aftermath by 2.55% and we've shown that 100tp refreshes are still valuable.
So the best method, when capable with 90 Red, is indeed to sekka Quietus -> Entropy and screw 300tp aftermath, because even the two subsequent 100tp aftermath refreshes are still more valuable.
Naturally this falls flat if you can't cleanly self-SC, but then 300tp AF isn't so far behind, but 90 Redemption is still only gaining a
pathetic 2.68% total damage from ODD on 100tp refreshes!
99 Redemption recalculation:
300tp opener instead of Sekka Quietus -> Entropy and 100tp AF: (2.465 WS loss + 6.893 Darkness) / (6.57 cycles * 2.0 per - 2.19 cycles * 1.2 per) = 89% loss, so 99 Redemption brings 300tp opening Quietus back to beneficial.
You just contradicted yourself in the same post. If ODD comes out ahead, then you keep it up and spam Entropy with AM3 up. If Redemption isn't worth using, you should make Ragnarok or OAT gsword and never touch scythe again.
At least that's what I'm getting.
It mostly changes the weighting of Redemption vs WoE Scythe as well as all other Scythes, as the latter retains the self-SC capability, TPs in marginally better gear, and is staggeringly easier to get to level 99.
Edit: And no, this modeling is carefully crafted to only consider the ODD activating WS, meaning you're still spamming Entropy in between refreshes, so this is actually still the best case and method for ODD application.
This whole discussion was based on being allergic to Resolution to begin with, but if you need a backup weapon or want the infinite MP...
You said earlier that lvl 99 redemption would be 3rd place. Doesn't it make it worth?
3rd place amongst Scythes, and
only Scythes. There's a fair half dozen weapons better than even 99 Redemption, and the analysis I've put forth here, cutting down the ODD advantage, is a very good basis to rate it just equal-or-trading with 99 WoE if you consider difficulty of obtainment as well.
To say: You could spend 20mil and have 99.9% of Redemption without the headache of managing ODD.