Go back to Norg and rewatch "Total Recall." The princes are annoyingly vague, and can be interpreted more than one way.
- They are pretty clear about Raogrimm being the reason they're awake to begin with. So they shouldn't be complaining that much about him being in their way, since otherwise they wouldn't be around to complain.
- What they are particularly vague about is what, exactly, the problem was. Eald'narche talks of "noise" (which was "finally gone") and "him." I could be reading too much into things, but it seems odd for Eald'narche to be referring to Raogrimm in the third person when he's sitting right there in the room (and is addressed in second-person elsewhere in the same dialog).
- The Shadow Lord still had a critical role to play at the Chrysalis Core, in "Return to Delkfutt's Tower." So, again, not strictly a problem for their plans.
Damage to the Crystal Lines themselves strikes me as a potential problem, but they don't seem to mention it.
And don't get me started on the Shadow Lord himself.
- What exactly is the source of his power (beyond "GALKA SMASH!" rage)? Is it from his pact with Odin or a bond with the Vahzl crystal? The former explains his affinity with the dark element and susceptibility to Demon Killer, but the latter explains why he (presently) looks like an oversized golem (arcana). It is possible that he first drew power from one and then the other.
- And if it is from his ties with Vahzl... how is that working? As a Galka, his affinity is supposed to be with Al'Taieu (tangent: explains why Galka reproduction is so weird). Vahzl is the Hume crystal.
At any rate...
Odin has his own agenda, and it's not clear to me that the Celestial Avatars really care about Paradise one way or the other (but my SMN is level 1 and I could be missing relevant content there). He's generally compelled to spread strife (his element) through Raogrimm/Lilith/Luzaf, and dialog from ToAU content indicates he's not particularly bound to Vana'diel (i.e. Paradise) in any event.
My one big question:
Where's the Light Protocrystal? Alexander was the original deity of the Moblins and whom they were digging for when they got distracted by Magicite/Promathia/whatever. Presumably they were looking for Alexander's body/vessel/remains/whatever from the prior Ragnarok. Is the Light Protocrystal there?