Yeah well... such inconsistencies sadly do not seem to bother them much so, i am afraid that all our clever guessings might eventually lead nowhere because they weren't even false
Clues.
Anyway, as the show develops of course i am asking myself how I would try to tell that story...
And in some points they and i even come to similar conclusions, such as putting up a phantom menace, a false shadow who is about to rise and against whom elves and Numenoreans will have to ally themselves... that must be Adar!
On the other hand there is a history for the Oathbreakers, they have to become Saurons servants first, they'll need a king who will then turn his sides but in the end break his oath... i see that with the Southlands-folk.
I still do not know how i would introduce Annatar... there has to be a crisis in which he will turn up and will pose as a Wizard, an Istar plus he must be accepted at last by celebrimbor, even if other elves mistrust him, he also must make friendship with some dwarves and with men... so he can later distribute his rings. How would i do that story?