Towards the end of KH3D there is a conversation made between Riku and Ansem the Wise. Is the data only pertaining to finding Aqua and Ven (Not listing Terra only because he is one of the 13 Darknesses) or also to the fabrication of Xion and Roxas as well? Seeing how one is able to conjure a heart simply by feeling one and light is made of honest thoughts and feelings. Both felt that, that being said, even they who aren't meant to exist can form their own heart and come into existence. Does this also mean Eraqus will be able to come back seeing how his heart resides in that of Terra's and technically he is only sleeping in the darkness, not truly dead.

At this point, everything is just speculation.

So far everything is speculation, English version may clear things up some but beyond that, depressingly.....we will have to wait and see.

the summer will bring all the wise answers

i do hope eraqus would come back though

That acctually wasnt Ansem the Wise, it was his research data that has taken his form. If there would be world inside Terras heart, im sure Erqus would be there as well.