^to me, the ck stuff is flimsy only the sense that he was devouring the multiverse in the true sense of the word. alternate earth 54321 was never devoured. neither was earth 72. or earth x.
any argument i've had with masters always revolves around the NATURE of eternity's multiversality. i think he encompasses more than just a single universe. i do NOT think he encompasses any alternate versions. death likewise. that's why death can deal with the cancerverse, but not earth 432. i think/thought we sort of agreed on that. regardless, that's my stance. with that in mind, i would never/have never claimed eternity is a TRUE multiversal entity, nor have i ever seen any indication of such, aside from the mention of the unique multi-eternity entity.
not sure if you've read the whole sandman series, but morpheus was shown interacting with alternate versions of earth during the series. world's end especially focused on the idea. prez rickard was a character morpheus saved in an alternate version of earth from that's world's ruler, boss smiley. he went on (prez) to walk the different (alternate) versions of america. so we have dream extending his power over the a variety of dimensions (even HELL itself) as well as extending his powers across the set of alternate earths. to me, unlike what ck has shown, that is TRULY multiversal levels of power that have nothing at all to do with the dc universe. i'm not sure where there is any ambiguity. /shrug given that, and given that lucifer is well beyond dream, beyond and outside the spheres of influence of ALL the endless, even destiny, that speaks to a massive difference in scope of power between he and ck. i'd place the endless above ck as well, at least in scope of power. depth is a more difficult thing to determine where the endless are concerned.