My Name Is Legion wrote:
So basically it sounds as if the argument is more about protecting the word "Marvel" as a trademark in marketing comics than an issue of copyright infringement.
That's the way I understand it. Trademark is a lot more "black and white" than copyright in terms of what's permissible and what isn't (I think). Marvel owns the trademark so Marvel can dictate what appears on the cover of a Capt. Marvel comic.
With copyright there is certain latitude in the law that allows for similarity of works, parodies, fair use, etc.