Spacewolf said:
well theres a simple way to derail that the C'tan cannot interact with the warp and the tyranids are controlled by a large hive mind that causes a shadow in the warp due to its size not its absence. and the c'tan dont care about killing everything they just want some cattle to herd
That was going to be point number 4, but I had a severe attack of 'oh shit, I can't be arsed to type any more'
I'm back now and I'm gonna say this to your little theory Undead Dragon King, it makes interesting but VERY flawed reading.
An extra problem with it :-
The tyranids are from another GALAXY, they'll only end up nomming they're way through every other galaxy in the 40k universe over time.
Oh, and not to forget the question of why the hell would the Outsider even bother? Alone of all the Star Gods, he doesn't care for the use of minions. He won't stop them from carrying out his will, he just won't actually make use of them.
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And another thing, the 'nids are harvesting biomass, not soul-energy, it's soul-energy that the C'Tan are after, and biomass that the Hive Mind is peckish for.
So as I said, pretty and flowery bullshit, but it doesn't
quite hide the fact that, I'm almost sorry to say, it's still bullshit at heart.