Why was this the Jailer's motive?

but what if… N’zoth (through his Il’Gynoth minion), Sargeras and the jailer all are seeing the same “thing” approach?

some of these quotes appear to mention Shadowlands storyline. Consider 9.2 storyline and the Anduin 3-phase fight among cinematics and other things…

  • The [boy-king] serves at the master’s table. Three lies will he offer you.
  • Her heart is a crater, and we have filled it.
  • Five keys to open our way. Five torches to light our path.
  • At the hour of her third death, she will usher in our coming.
  • From the earth, he draws strength. Our earth. Our strength.
  • Its surface blazes bright, masking shadows below.