Board Thread:Theories and Speculation/@comment-34436338-20180123200352/@comment-1872728-20180201025628

Here's a possibility: God: Nativity of a World of Trees slowed the healing process, and it was too late when he got out. Naruto offered to fix it, Tsunade also offered to make a new one, but Guy would be like: "Don't think I can live with only one leg? I'll show you to true potential of the Power of Youth!", or something along the lines.