@jagernutt: The story that starts with Thanos Vol 1 Issue 8. Where they explain that the Maker is insane. And that she only used her powers for a short period when she broke through the madness. Just going through Thanos 8 you will see at least 4 mentons of Maker being depowered due to her madness. And that they feared her gaining her sanity back. And she was telepathically shut down by Oracle too. A random Shi'ar Telepath with TP that is not really impressive.
Post the exact text that explains her being depowered due to madness. I've read Thanos solo series and do not recall that ever being said.
Oracle's entire race possesses telepathic abilities. And Oracle is the strongest member of an entire telepathic race which would explain why Oracle is also a member of the Shiar imperial guard. From what I've gathered Oracle worked directly for Empress Lilandra as her go to telepath.