Headcanon...Skeletor is actually a future version of He-Man...traveling from a dark timeline where he has been corrupted by the power of Grayskull
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Now that you look at it, I get where you're coming from
both are Batman
The Grayskull castle looks that way because they wanted to create a toy castle that looks both intimidating and generic (not really, though) to be inhabited by either villains or heroes (you could change the flag on the castle from one to another).
wasn't skeletor originally made from the same mold as he-man?
And you never see them together in the same room! Well, actually, you do. I didn't think that through at all. Sorry, everyone.
You sold me. Also, big fan of your work. Both your design work and the positivity you generously sprinkle out to the world. So glad you’re you!
That’s really nice of you to say...thank you!! 
That's because the toy tooling is the same to save on cost and Mattel made the cartoon. Product came first, then story.
Very cool concept though! I really like your idea and think it'd be a really cool direction.
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