There is no Thor after Ragnorak, at least not yet. He's asleep somewhere.
RKT was King Thor, with Odin's power and the power of the Runes (Magical word things that gave him the ability to do pretty much anything he wanted).
Read Thor's newest series, 50-85. It's the greatest Thor comics ever.
Oh, read Loki 1-4, too. You get to see Loki for what he is, not evil...just really ****ed over by Odin.
Originally posted by long pig
I never saw it being stated that he was more powerful than Odin until the runes.The runes made him stronger, wiser and amped his magic-spells-attacks up a few thousand percent.
The odinforce filled him before he was able to use the runes, and he was bonded with his father, by exceeding him in sacrifice, he was granted wisdom and power beyond that of his father.
That and the fact that he had lived as a mortal gave him the strength, courage, and wisdom to do what needed to be done to end the cycle created by the Pantheon.
That's just my interpretation.