Orochimaru vs Kabuto
We've had multiple theories on orochimaru and etc
But this one is on his abscence in the series since Anime episode 131 wasn't really a big thing
What if Orochimaru recruited Kabuto for the sole purpose of continuing his research if he ever died ? Knowing Orochimaru he was a man who considered every possiblility and always suspected that someone would eventually succeed in killing him.
Before Orochimaru died he put several things in place to ensure his revival, continue his research without directly being involved and finally becoming strong enough to take over a Uchiha host.
Orochimaru's backup plan if he died
Orochimaru ever since developing the curse mark and recruiting Kabuto always planned for Kabuto to continue his research if he we're ever to die and for the curse mark to act as several "respawn points" to just continue.
Kabuto Training in place of Orochimaru
However Orcohimaru knew it wouldn't be a instantaneous thing so he had to compensate for lost time in somre sort of way while he was gone. That lead him to recruit a apprentice with the most potenial and intelligence to do this. Once orochimaru died his theory turned out to be true with Kabuto continuing his research but on a amazing and unexpected level with Kabuto doing all of these things for Orochimaru.
Orochimaru coming out of Sasuke's Curse Mark as a revival point
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-Perfecting Edo Tensei
-Developing and Learning Dragon Sage Mode
-Forging a Alliance with Tobi
-Making a body closer to the S06P than anyone alive (all clans and things included inside)
-Sage Art: Inorganic Reincarnation
-Several other powerful Techniques
Kabuto's Dragon Sage Mode
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How Orochimaru never actually died or lost any time?
Like said above Orochimaru will be back as Sasuke stated, Kabuto was never meant to be a villian and when Orochimaru returns he will take over Kabuto's body or simply absorbing him into himself same as Kabuto did to Orochimaru.
Kabuto was made a main character for the purpose of making Orochimaru stronger in his absence and for him to reclaim his lost time in the land of the dead.
Overall Kabuto was simply training in place of Orochimaru and developing his Techniques for him while he was unable to. Kabuto really had no place in the anime/manga as a villian because of his copy cat nature and immature reasons for becoming a villian.
Kabuto Training in place of Orochimaru with the Snake Sage
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We will be seeing the Full Power of Dragon Sage Mode from Orochimaru in a big battle
What do you guys think of my Theory?