You may be wondering why, in Mega Man X 5, that this is considered to be X's 'Bad' ending. After all, despite the death and disappearance of Zero, X is fully repaired and the world is getting back to normal, with X talking about his dreams. Think about it. The dream that X is talking about is actually Fore Shadowing for the formation of Neo Arcadia in the Mega Man Zero series, and, (if Keiji Inafune had his way), his eventual Face Heel Turn. And, with no Zero aroundto stophim....
In one of the "X7" endings, Zero has a nightmare in which he and an Ax Crazy X are fighting to the death. What do you face in The Mega Man Zero series? An Ax Crazy doppelgänger of X. Counts as a Shout Out rather than Foreshadowing because "X7" came out after the Mega Man Zero series began.
Maverick Hunter X introduces a possible reason for Zero's Superhero Speciation away from using his buster: he can't aim it. In Day of Sigma he fails utterly at hitting the Mechaniloid's weak point without hitting its hostage (something which Sigma claimed X was able to do) and in the intro stage of the game proper he tries to shoot Vile when he's escaping in the Death Rogumer, with similar results.
A problem that gets remedied in Zero's own series, where he gets his hands on a Buster handgun with a sight.
