You're assuming that Finnabair's death is part of a conspiracy but, you have no way to know that. It's more likely that a certain dumbass Templar killed her or had her killed and, as it turns out, plays right into the hands of your third party. That's a much easier to follow scenario. We could come up with lots of theories that are more plausible than the grand illusion fake funeral. The fact is we don't really know, yet, what happened to her; only that the Alfar are accusing the Templars. For now...
That's true, it could be entirely random, but the timing of it is surprisingly apt and it was apparently by a templar when they have no common grounds they interact with, moreover it would have to be a high ranking templar in order to freely go to places that the templars have deemed off-limits (as the game noted, templars and elves have been zero or very low contact for a long while) at which point it seems unlikely that Linnae wouldn't have heard of it, and while she's also sketchy, she seems to not be interested in the conflict either and have gone against the templars plans before.
EDIT: It would be fucking HILARIOUS if it was Kaiju actually, I just thought about this, given her absolutely zealous loyalty to anything templar-related, she's also one of the few good enough and high ranking enough to have done it. God I hope the dev pulls the trigger on that, would be very cathartic to have her head sent flying.
Again basing things off of risk versus reward, it seems more likely that this is orchestrated somewhere within the elves as why else would someone as culturally and familially important as Finn (given that both Medb and the ice queen attended her funeral) be thrown off to the frontier or into templar territory?
She's good, but it also doesn't make much sense given how much we were told in the chapter about how important both family and young elves are due to lack of reproduction. The fact that she was also acting as basically a diplomatic contact at the time just further cements my suspicion that whatever happened had to do more with the elves than templars.
I personally thought it made sense. Simply because if there really is a third party they could easily use her death to spark the start of a Templar VS Elven war. Then when it comes to Medb the death of Fin is probably going to cause her to spiral and go through a character change and growth at some point. As well probably more character deveolopment and lore deep dive id imagine. Now if it was just some random templar that killed her yeah I feel her death would have less meaning from a story point of view.
But again, she already harbored deep hatred for humans and especially templars, keeping her and using her to influence Medb would be a FAR safer and more logical option as murdering her will basically turn Medb into a coin flip given her interactions with the MC thus far.
Medb could either go full ballistic on humans, or get suspicious about the circumstances, and given how she handled the MC and telling him to leave to avoid becoming a political hostage, she seems far more inclined towards humans right now which would work against the plot of whatever third party is involved, would it not?
Again, something there just doesn't make sense from the point of view of starting a conflict. Yes, this likely will start a conflict but there are WAY too many uncertainties for that conflict to yield good results,
unless the conflict is solely a distraction for the third party to move.
