User blog comment:Xilinoc/Ch. 595 - Rubb-Dolls 2/@comment-493809-20140906232130/@comment-5693502-20140906234249

Could you imagine Yhwach having the powers of "The Overkill", "The Superstar" and especially "The Visionary" (as well as every other epithet-wielding characters that have died) ? His base power of Soul Distribution is story-breakingly strong as it is. If he gets the individual powers of each epithet as well as their raw power, there would be no-one that could match him (unless Kubo decided to implement the biggest Ass Pull ever... or if he gave Yhwach an especially potent Idiot Ball).

The second theory sounds pretty reasonable though. Although how would Yhwach absorb the power of Hollows if they're caustic to Quincies (assuming Yhwach is also definitely a Quincy) ?