That’s not really any different than what went down during Mark’s era, where the Hulk went from just having extremely tough, durable skin to instead having rapid-healing of an almost Wolverine variety. Different creators interpret the characters differently, and so long as the editor approves it, all within the acceptable tolerances of the Marvel Comics Group.
Heck, Thor used to pull strange one-time powers out of thin air in virtually every issue in his earliest days. And remember when the Sub-Mariner could shoot lightning or expand himself like a puffer fish?
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