Worstgen
ZenZu
Sure. I don't use YC4, 3, 2 though but if you're saying those guys are close in power, and clearly below Cracker then I agree.
Cinera
Where would you place DR Zoro and Law then? I find it hard to accept they are on the same level with those 3. All 3 of them seem like opponents they might take out at (perhaps even the lower ends of) medium difficulty.