REGISTER TO REMOVE ADS
Yeah he just was there so the Organization can get more of Sora's memories.
Oh. Then maybe it was just a mission?...
It's more that him and Axel came with Xion in an attempt to find out more about her.
What does CO stand for
Castle OblivionWhat does CO stand for
I don't remember them saying he couldn't go there. He may have a mission there or sent there to learn more about his other. But overall yes Roxas can go to the castle and has been hinted for a while now.