I think they added that plagueis scene after the fact. Perhaps recently since people were theorizing about it as him being behind it all. It just makes no goddamned sense in the context of this show. How would Qmir and plagueis even know who the fuck Mae or even OSHA are without first being directly linked to the coven witches in some way? The twins existence was covered up and the coven witches are all dead except perhaps Koril. Yet there is no connection or even an explanation about the hole on Brendok, the vergence or even the purpose of the coven? Why would Qmir or plagueis come out of hiding to train Mae unless they already had some intelligence on her powers or the situation between the Jedi and the coven?
Qimir doesn't even have a story or reason to be there (beside the obvious eye candy for young women and some decent lightsaber fights).
Like, at some point before the story begins he picks up Mae and decides to train her to become a Sith acolyte. So he gives her a quest to go kill the 4 Jedi Masters who fucked up her life/childhood. That's... a test to see if she is skilled and can do evil stuff I guess, but it's really HER quest... he has no real reason to attack those particular Jedi or get them killed, his only beef seems to be with green chick Jedi Master who probably lashed his back with her laser whip (never really elaborated upon), and probably had him expelled from Hogwarts.
So anyway he pretends to be a henchman of himself to keep tabs on Mae, and then once she's on the jungle planet her heart's not really into it anymore and she kind of wants to drop the quest altogether... so he disappears, and kills all the Jedi including the wookiee except for Sol, and then the sisters get switcherooed so he.. just takes Osha now?
He brings her back to his backwater planet, they have lunch, she checks him out naked because lesbian showrunners are experts at how the whole man/woman thing works. Then she tries on his helmet and she freaks out and has witch powers. She's now evil apparently.
So she has a vision of her sister and decides to take Qimir's ship to go there.. which he lets her, for some reason. He also says he's going with her. For some reason. Once there, he thanks Sol for leading him to Mae, but... never really finds Mae or does anything with her. He fights Sol, then when his green chick old master arrives and they clearly have a beef, he.. just disappears. And then he finds the two sisters. Now I suppose both are "evil" since they're at least in agreement to how the Jedi lied to them all along, and killed their mother and destroyed their childhood... but no, instead of taking both sisters back to train both, they suddenly all decide together to wipe Mae's memories completely.
Then he takes Osha back to his planet, to.. train her some more I guess? What's his motive behind anything he does? He looks like he's just so bored on his water planet that he goes on sidequests with newbies to kill time.
If anything since they introduced Plagueis, you should have had Plagueis send Qimir to investigate on the beings created through this Force vergence, and find one of the sisters, and looking for the other since they're basically one being split in two because probably the witches fucked it up.... it would probably still have been a shitshow because the showrunner is a dumbass, but it would have made sense to have Plagueis want to investigate a sorcery he's been looking for his entire existence, and would make sense as to how he later tried to do the same and succeeded with Anakin.
You'd have the Jedi trying to find the sisters to protect them, and Plagueis wanting them both captured to probably dissect them or something but manipulating Mae all along by making her believe her sister is in danger because of the Jedi. Anything would have been better than this tripe really.