It's getting very interesting to be honest.
Chaos Melascula & Galand are easily the most entertaining commandment duo out of the entire brigade, but they'll most certainly get shafted and humiliated for someone else's glory in the end, I'll scream if Nakaba shafts them for Meliodas...
Even if they're only as powerful as they were before the power of chaos, only Meliodas & Elizabeth could put up a fight against them. And depending on how much power Arthur has given them, maybe even they couldn't defeat them. This seems plausible when Melascula/Galand claim to want to kill all of the sins, along with the four knights. They'd need the power to at least rival the five sins, if they wanted to kill them. But Hendrickson sensing their presence as the same magical energy comparable to that of the commandments implies they might not be that strong, who knows. Then again, if that other hooded figure is Merlin, then anything can happen since she's a complete wild card.
It would be an interesting dynamic as well - Galand coming back to see Meliodas, the traitor who humiliated him multiple times during the series, and Melascula, finally returning to a humanoid form after Elizabeth robbed her of it. It would be an interesting fight which leads off of previous relationships & fights.
But will Nakaba actually show Elizabeth? Will she finally come out of the Castle and fucking do something? Who knows, maybe she'll come out to get fodderized so we can see Meliodas ass-pull another Demon King form? mhmm...
Am I the only person who feels like she Merascylla wasn’t humiliated? She fought all of the Sins and Elaine and held her own while doing so. She lost of course but the only Commandment to put up that much of a fight was Zeldris.
I agree with this. Ban did kind of disgrace her when he destroyed six of her hearts, but her final fight was pretty satisfactory and as Merlin clarified, Melascula didn't even use her full power.
Meliodas about to rekt these guys so hard

Hopefully Elizabeth actually fights as well.
Oh, I just realized Mera and Galan were under one cloak. So there is another mysterious person.
It's probably Merlin - since the person is said to know Liones well, and hiding their identity would mean their face would be easily recognised (like Melascula's).