Your information is inaccurate. This is an interview with a Lead Blizzard designer that says that the Eternals are equal to Titans.
https://www.wowhead.com/news=316822/...gendary-power-
Eon himself stated that the Jailor is Titan++ in power. You can watch it on YouTube.
Your interpretation of "Power" is not relevant, the same goes with the Anduin argument because I can go and begin my own interpretation that Anduin is the Chosen of the Light and can delay the Jailer for a few seconds. But I won't because I debate canon.