NinthMusketeer wrote:Hm., I do not understand your argument. Can you give me the source where it is actually written that Slann=Old Ones?
Rogue Trader, p. 194, on the section for Slann. It describes how they explored and nurtured primitive races and cultures, engineering races, and seeding worlds. Basically all the things done now by the Old Ones. Just replace every instance of Old Ones with Slann and you have the same story.
Realms of Chaos Volume 1, p. 215. The Eldar are described as inheriting the warp gate network of the Slann (i.e. what is now called the Webway, and attributed to the Old Ones). Again basically replace every instance of Old Ones with Slann and the story is the same.
As already mentioned the 3rd edition Necron Codex, which among other things set out the basic though now modified framework of the War in Heaven, specifically said to use a Lizardmen army to represent "degenerate descendants". Descendants, not servants.
Old does not mean automatically outdated, not unless contradicted.
Xenology's flaw is of being an in-universe narrator (and one that proves to have been deceived on certain points) conducting research on various biological and archaelogical findings, so its conclusions are not necessarily correct. Translating ancient legends of Old Ones being like shining energy beings may be inaccurate (see my earlier post about how for example the
WHFB Slann invented depictions of their Old Ones without ever actually having seen them).
GW has pretty much laid out the dotted lines like they usually do when they nudge and wink towards something.