Board Thread:Questions and Answers/@comment-31762568-20190731130601/@comment-31762568-20190803165234

Warrior Of Time wrote: No that would be horrible. Or he may have taken the power of the Sphere and become Shadow again but he may able to switch between both human and shadow form.
 * The in universe reason would be that it was not a desired form for him. It was a punishment he received from opening the gates of Shadows. He was literally reduced to a shadow instead of a normal human being. He despised that state and fought very hard to receive his own body back. And by the continuity, the rest of the story continued in his normal form. It would make no sense from any angle for him to regain Shadow form. It was only due to the gates of Shadows.
 * The real world reason is simple. It would be very dull and boring. We have already seen so much of his Shadow from. We want to see his true abilities and original body. Which would look much better in the 2.5D version. The shadow form will look just like when the player enters Shadow form. It would be much better if there is no mention of shadow form for him. And yes it would be normal for him to just transform into Shadow form for 10 seconds like every other character.