Well, the
https://sagamer.co.za/2020/08/20/a-d...f-hibernation/ one is more recent, and very particularly focuses on the subject on who stands where.
To be honest, I myself don't even consider the Eternal Ones to be on a Titan Keeper level. They are just shown as inept again, and again, and again, and agaaaaaaain...
In this very quest chain mentioned in the OP, the Winter Queen "hides" her sigil(the one that she is trusted to protect with her life), then she does... Wait, what does she do? Instead of protecting probably the last(or second to last) "key" needed to
unchain the Jailer, she hides it, and get this, in the bloody Heart of the Forest. Who would have thought that she'll hide it
there of all places??? I wouldn't, but apparently the Jailer or Sylvanas did. One would expect her holding the sigil with herself, and defending it to her last breath, but... I guess she wanted to "live" more than she wanted to stop the Jailer from breaking free. Maybe she is just not that concerned about him.
The Eternal Ones are shown as a bunch of clowns from the very start of Shadowlands. The very questing experience made me want to facepalm on several occasions. They wouldn't be able to repel a simple murloc invasion, it's laughable comparing them to Titans.