Jirohnagi
Braava Braava
what if he does? it would be a change though.
Demise would have new fighting skills and u would enjoy fighting him!
Would physically be impossible at this point to work him in, he's been dead tens of thousands of years with no hint of existing not really a way to bring him back, well unless we go the Kid Icarus route and make a magic rejuvenating fountain and dipped the master sword in it....theres no chance.
Demise's conscious has long since dissapated all that's left is a primal hatred that infects Ganondorf and even then by this point it's become more human than demonic and at that a more in-grained thing.
WW Ganondorf didn't bear WW much Ill-will until Link stood up to him and reminded him of the Hero of Yore.