I have fond memories of years ago when I was trying to complete the various eternal champion sequences by using the book listings in the cover of the books. It was a challenging experience because sometimes books would be missing (presumably because they were earlier editions in which the later editions were yet to be released) and sometimes (as previously noted) the same book would be listed under different names.
And there were confusing things like interconnected series. The "Chronicles of Count Brass" and "Erekose" ("The Eternal Champion" and "Phoenix in Obsidian") used to both conclude with "The Quest for Tanelorn". That is until "The Dragon in the Sword" came out to conclude the "Erekose" series in a different way (which I am yet to read).
Confusing indeed!
Yes, that's where the "grand overall scheme", so to speak, comes into play -- because, really,
all the tales wrap up with
The Quest for Tanelorn, which closes the cycle itself, and includes recaps of the endings of the Elric and Corum sets (with a slightly different emphasis). Or is it with, as you note,
The Dragon in the Sword, which even mentions the "field of statues" of the earlier novel, yet allows the cycle to come to a resolution in a different fashion? Or is it with the "Second Ether" books, which also provide an ending to the cycle....?
For those interested in becoming truly lost (and found) in the labyrinthine wanderings of how the cycle as a whole is structured, these:
Suggested Reading Orders - Moorcock's Miscellany
A Proposed Moorcock Reading Order - Page 3 - Moorcock's Miscellany
But, as Moorcock himself has said quite frequently, it is best not to worry about reading order too much, but just go with what's available and work out your own over time. I have my own, for example (just as I do with a viewing order for
The Prisoner, another series which has fomented considerable debate on this point) which differs in some respects with any reading orders I've seen proposed -- yet it works quite well, as themes, characters, and storylines are introduced, developed, and reach resolution (including a final resolution for the cycle) in an aesthetically pleasing fashion....