You know... I always wondered, who besides Dr. Wily would think the idea of a "Robot Museum" is such a great idea, anyways? I mean, it takes everything Wily would need and puts it all in one convenient location. And ever since it's introduction in MM7, it's been nothing but a hotbed of trouble!
More to the point, I think MM8's reappearances allude to CutMan's original design, IE a lumberjack; and how it plays into WoodMan's creation. How else do you explain a Wood robot? They both appear in Power Battle/Fighters anyways, so whatever. (Honestly, the classic titles were far too "melodrama" to make any real sense. Every "story" was just an excuse to fight 8 more Robot Masters. Or in one case, 16. And the most recent's, 9 of them.)