Board Thread:Warhammer 40k Novels/@comment-27376167-20151210113237/@comment-24091837-20160416084212

Zixis, even though current lore might state the Tau as having discovered fire in the 35th Millenium, remember GW can decide whenever they wish to alter the background lore of any part of 40k lore, and so if GW ever decides to say the Tau discovered it some other Millenium, then your argument becomes invalid.

GW have in past instances rendered previously established lore as being invalid once they find a storyline that suits there purposes better. This is all speculation based on a work of fiction that the licence holders occassionly alter the back story of. Keep in mind that even officially sanctioned story writers for the novels contradict established lore either by design, or by accident.

As I stated earlier, GW have left the fate and backstory for two primarchs purposely vague, so that we as fans can do our own thing for them. Many theories abound regarding the 2nd & 11th Primarchs, and all of them are taken as equally valid despite being quite different. GW are always intrigued to see what ideas players/fans come up with in relation to these lost Primarchs.