Ah, thank you, I forgot about that interaction. For completeness, I will include it here now.
Kyrestia the Firstborne says: You speak for Revendreth? Where is your sire? Where is our brother Denathrius?
Prince Renathal says: My sire… has betrayed us all.
Prince Renathal says: The drought was his doing. He stole the very lifeblood of our realms, starving his own people… and yours as well.
Prince Renathal says: When his lies were exposed, Denathrius unleashed his vast coffers of anima into the Maw… to fuel the might of his true master.
Kyrestia the Firstborne says: Long ago, we stood as one to imprison that… monster.
Kyrestia the Firstborne says: With the Primus gone and Denathrius a traitor, our pantheon has been broken… and doom comes for the Shadowlands.
Prince Renathal says: There is yet hope. This mortal saved me from the Maw and revealed the sire’s treachery.
Winter Queen says: They aided my forest as well. Their kind has shown great potential. If focused, it could turn the tide in our favor.
Kyrestia the Firstborne says: Agreed. For the good of the Shadowlands, each mortal must choose a covenant.
Winter Queen says: And when our realms have regained their strength, we will stand together against the darkness.
Tal-Inara says: I will see it done, Eternal Ones. With her voice have I spoken.
Tal-Inara says: Come, mortal. The hour of decision is at hand.
Given that this is pretty much exactly what happens before Tal-Inara explains the rationale for why the Maw Walker must choose one covenant.
Each covenant is vital to the Shadowlands. Though they often seem at odds with one another, this too is part of the Purpose. All the covenants need to grow strong to face the threat of the Jailer. But your efforts cannot be divided. / Each covenant is vital to the Shadowlands. Though they have been isolated and divided as of late, the Purpose depends on the success of their efforts. All of the covenants must bolster their strength to face the threat of the Banished One. But your contributions cannot be divided.
They [your efforts/contributions] must be focused upon a single path. Other mortals may make a different choice.
In light of what is being said here, we need to keep in mind some of the authorial intent. This is the game speaking to the players, right? It’s giving a rationale for why the mortals must focus their efforts; The covenants are too weak to stand against the dark, because of the anima drought and the lack of souls. The only people who can help the covenants return power to the Shadowlands are the Maw Walkers, who are mortals, because they can rescue the souls trapped in the Maw. And it would be better for the Maw Walkers to focus on one covenant at a time; to learn their ways and to restore their realm.
I think it is therefore safe to assume that Ol’ Emma and Griftah weren’t told to pick a covenant. They’re not those kind of mortals; they’re not able to help the covenants with the anima drought. So, in other words, not all mortals are bound to choose, because not all mortals are Maw Walkers, who are the only people who can meaningfully contribute to the problem that focusing the Maw Walkers’ efforts are supposed to solve.
However, there are more ways to contribute than that. It’s very clear that the Shadowlands deal with more problems than simply anima; they have issues of war to deal with as well. I suspect we will see more mortal activity in the next couple of patches, along the lines of mortal armies supporting those of the dead.
It is also possible that using Oribos as a waystation is actually too taxing on the anima reserves and that is why mortals are only allowed to enter Oribos.
TLDR: Thanks for pointing that out. In context, it seems to me that the council is talking about “people who can meaningfully contribute anima, aka maw walkers” rather than all mortals. Not all mortals can enter the maw, but mortals can still contribute to the battles that are taking place outside the maw without being maw walkers.
I think that’s the big question at the moment. Can regular mortals enter the realms other than the Maw or only Oribos?
EDIT: Addition:
Quest: Return Lost Souls
Description: Souls continue to pour into the maw. THeir anima, our very lifeblood of the Shadowlands, is going to those souls to fuel the Jailer. You rescued me from the Maw. I see no reason you cannot pull more souls from that abyss. Bring souls you rescue from the Maw to me and I shall put them to better use. At least in Revendreth they have a chance of redemption.