I know most people on this site have most likely already heard this theory, but i want to tell anyone who hasn't about it. "After the proceedings in Ocarina of Time, Link had no further use for Navi, so her job helping him done, she went her own way, after Link watch her go, he go back to his kokiri home, and sleep in his bed, the following morning, he get up like usual, but instead of going out the main entrance of the village, he traveled into the lost woods, after going through several of the logs, he look around and find that he was lost, starting to blindly walk around, he'd find that the tales were true, that when you wander into the forest, you would turn into a stalfos. Slowly turning into a stalfos now, he begin to imagine the events that had taken place in Majora's mask, the more he transformed, the more deeper his imagination in the story had gotten, going from temple to temple, to save clock town, from the Mask that the Skull kid was wearing. After being turned completely into a stalfos, in his mind, he had completely beaten the mask, and restored peace too the land of Termina, although he was different from most Stalfos, his coat was a shiny gold color, now setting off in the right direction, leading out of the lost woods, he set off and left the sacred forest grove, seeing that it was far more different then when he was a normal boy. Another new few temples had been around the area, and he make it his own quest, to patiently wait for the new Hero of time in the land, wearing the heroic green tunic, after meeting him, he takes him into the spirit realm, so too speak, teaching him moves too use against the evil lord gannon, and destroy his evil... Again. But, in the "Spirit" Realm, the blade the "Stalfos Knight" wields, looks slightly similar too the master swords design, only making this theory seem much more hard too not believe."
