Question about Orochimaru?

I know sasuke "killed" him and he was sealed away forever during sasukes fight with his brother itachi but i was thinking will he possibly come back through Kabuto. I also have been theorizing that that version of orochimaru could have been fake and it was really some freaky clone he grew in one of his laboratories through one of his genetic experiments that he was known to conduct all the time and the real him could be in hiding, or maybe that madara really is orochimaru in disguise because i saw the recent episode online when zetsu came out of floor behind madara while he was putting that cloke on and his right arm appeared whiter than the rest of his body along with having black fingernails. Maybe he faked his death by that whole genetic clone trick and is in fact madara at the same time. Of coarse that would have to mean that his immortality jutsu is not flawed like everyone thought but is in fact unknown to everyone else flawless. I know everything I theoried but the one him taking over kabuto is highly unlikely but wouldn't that be so sweet. I mean i can't believe that sasuke could succeed where jiraiya and tsunade both failed along with god knows how many other shinobi throughout the years not to mention his own sensei the third hokage also failed and who knows you better that your own sensei for god sakes! Sasuke might be an uchiha but he was still only a freaking child with only a few yrs of experience under his belt I MEAN COME ON!!! It seems like orochimaru BEING orochimaru would only get "killed" by a kid or anyone for that matter unless he had some plan in place. What do you all think?