I can't speak on the others but I know that shatterstar has his name because when he was a gladiator, a boy asked him if he was strong enough to shatter the very stars. Then the crowd started chanting that, and it became his name.
Avengers don't kill that is why they needed Wolverine. You can't lock some problems away. what happens when Mad Jim Jaspers or Vulcan attacks. How do you lock them up.
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