So, we finally get the rest of the jigsaw; the rest of the backstory that was missing from the third episode. It does all make some kind of sense now. These aren't great examples of Jedi. Torbin and Kelnacca are weak and can be possessed. They all lie and allow their emotions to overcome them.16 years earlier, the four Jedi discover the coven while investigating a potential "vergence" in the Force on Brendok, which could create life. The Jedi Council decides that the twins are too old and should be left with the coven, despite Osha's wish to become a Jedi; Koril stokes Mae's anger over Osha's decision, leading to Mae accidentally starting the fire. The results for the twins' "M-count", which shows their Force sensitivity, indicates that they were artificially created with a single consciousness split into two bodies. Torbin, eager to return to Coruscant, sees this as proof of the vergence and rushes to retrieve the girls. Sol follows and the pair confront the coven before Kelnacca and Indara arrive. Sol kills Aniseya when she attempts to use her power. The witches possess Kelnacca and use him to attack Torbin and Sol until Indara overpowers them. Sol is unable to save both Mae and Osha from the burning fortress and chooses to save Osha. As they return to Coruscant, Indara decides to blame the incident on Mae's fire.
We also see that while Mae did accidentally start a fire, she was neither responsible for locking everyone inside, nor for building a castle out of inflammable walls and floor tiles.
The Jedi Council got this right. They should have left the witches alone, and Osha and Mae were too old to become Padawans. Sol is worst of all four Jedi because he disobeyed the Jedi Council on everything, lied to cover it up, and continues to lie without remorse.