I think the Avengers and the X-Men are different, in that the Avengers is a quasi-paramilitary organization that has a charter and bylaws and so forth. It’s a professional organization, and therefore has a relatively strict definition of such things. The X-Men are an activist group and an academic group. Their set-up is not so rigidly defined, nor are the members of their organization. So sure, I think Sunfire was an X-Man at one point, there’s no denying that.
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