The problem is what individuals we're talking about. Let's take a Grey Knight - you need a million psykers, which are themselves one in a million deal, to produce just one. Then, out of thousand Grey Knights, maybe 8-12 are strong enough to battle Greater Daemon. These numbers are pretty much even worse than ones you need to produce ascended being in Stargate universe.
That has no relevance. The Imperium cannot produce one ascended being; thus has no individuals of the mental strength required to ascend... An Ori is thus mentally stronger than Kaldor Draigo, and bitch slaps it. Or we could just remember that they're separate settings.
The problem is, orbital bombardment doesn't work on daemons. As in, regular daemons, not greater ones. Once Warp is weak enough for them to manifest freely, you need to cut them off from Immaterium somehow, forcing them to run, regular firepower does nothing.
Please post a source where a greater demon takes something that can annihilate a starfleet to the face and keeps on trucking. Also remember that we're talking about WHFB too here. Where demon armies can be and are defeated by guys with muskets and cannons.
That, and the match above is worst possible one. Ascended being might be immune to Chaos diseases (Nurgle), being cut with an axe (Khorne), seduction (Slaanesh), but I doubt he is immune to pure magic (Tzeentch) it has no idea how to defend against. Failing to find? Lords of Change have precognition and supernatural access to knowledge, they have reputation of having everything done against them to turn out 'just as planned' for a reason.
No, resorting to memes will not produce an answer. How can chaos corrupt something it cannot sense? Something without a soul? Even in 40K, chaos is not magical, in most sources you can just say 'no.' How can a demon fight something it cannot touch? Which can blast it with megaton bolts of firepower every second.
Chaos corruption is a brainbug. I want you now to explain how
chaos will corrupt an Ori, or concede. Do not resort to "a wizard did it" or "taint" what power will it use? What inducement?
To corrupt Horus they had to do the whole shebang in Horus Rising. And he was a guy, with a physical brain to futz with
, not something as out of their experience as an Ori.