Last I checked, the theory with the Stalfos that teaches Link new moves in Twilight Princess was that after Majora's Mask, Link kept hunting for Navi and ultimately got himself lost. Like those that get lost within the Lost Woods, he became a Stalfos. Being the Hero of Time though, he was not entirely bound by the loss of self that comes with the transformation into a Stalfos. Instead, he became a being able to interact, but trapped within his own dimension. Of course, that is just one of a few, but that is the one with the most evidence backing it. The Stalfos like creature's mention of having accepted the title of Hero before (once receiving the final secret move in TP) suggests that he was in fact, the Hero of Time.