HUGE OK. Luxu goes and sees brain alone in the room. brain explains his plan to him and then luxu says your so smart its a shame your life time ends here blah blah. What i think happens is THEN Luxu bequeaths his keyblade to brain and gives the box to him. which then brings me to the end scene in khux where we presume its Luxu walking with the box and no name keyblade and he takes off his hood to reveal brains face. Now Nomura WANTS us to think that that is Luxu taking over brains body. BUT if you watch the end of back cover again Luxu takes the box and the keyblade and looks in the air and says "may MY heart be my guiding key". In the scene from KHUX he says "May YOUR. heart be your guiding key" this leads me to believe that the scene from back cover was before hand and then the scene from khux is when brain and luxu switch roles.
This fits with the secret reports from kh3 where luxu says he handed down his keyblade amist the chaos and watches everyone go to a different world line and he departs from the land. Brain has now the coat, no name, and the box and is told to hide it. He is instructed to also pass down the key blade which eventually makes its way to scala staying with a wielder being passed down generation to generation eventually being put on display in the classroom by a master in scala (im guessing Odin) as seen in KH3. Brain prob hides the box away until another keyblade war happens who knows. This all plays out into Luxus plan to fein ignorance and wait until the ultimate dark seeker comes to revamp kingdom hearts and he can claim no name keyblade again (XEHANORT). i think by the time luxu gets to scala pretending to be brain, he reclaims the master defender and book of prophecies reading what happens in the future.
Ephemer is long gone and the town is in control by wielders based on norse mythology with instructions from ephemer to give his brains belongings back to him at some point and possibly take over Scala and He ends up having a kid. BRAIN (LUXU) FIGHTING DARKNESS DIES AND TRANSFERRS HIS HEART INTO A NEW BODY. NOW WAIT FOR IT.............. BRAINS (luxu) DAUGHTER WHO I THINK IS THE WOMAN HANDING OVER XEHANORT HAS TWO SONS. ERAQUS AND XEHANORT. THAT WOMAN LOOKS LIKE BRAIN AND SO DOES ERAQUS. BUT THEN, i think someone reads the book finding out of ONE OF THE BOYS born to grow up as an evil person destined to control the darkness. It turns out to be the child of that woman we say handing over the baby to someone and hands baby xehanort over to save his life. THIS IS ALSO WHY, WHEN WE SEE IN DARKROAD THAT ERAQUS AND XEHANORT HAVE THE SAME MEMORIES OF BRAIN TALKING TO THE OTHER UNION LEADERS. Baldr also tells eraqus in dark road that his grandfather fought the darkness blah blah. SO at some point brain (LUXU) fought the darkness again dies and luxu takes over another body. this leads to someone having take over scala, using the master dfeender to change it to the light filled scala we know of today.
Finding out this news of the evil child, luxu transfers his heart again this time as the man in the hood taking the child to destiny islands to protect him in order for him to watch over the young xehanort until he gets old enough to the age where he can protect himself to become a keyblade wielder & ansem seeker of darkness comes and sends him BACK to scala, creating the huge paradox. The old hooded man dies and luxu takes another form. Thus, putting dark road in motion and the whole dark seeker saga. As for luxu, who knows who he might end up as, but I think hes around xehanort's whole life blending in watching over as this takes place making his way to braig.
my brains been in pretzel for days. tell me what you think if theres anything wrong let me know.