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Isn't the M.O. of the Marauders plausible deniability for the X-Men/Krakoa? Wearing a big X on your belt would seem to toss that out the window.

Didn't Sharon Ventura turn up in human form in the Sam Wilson Captain America series - the issue with the Unlimited Class Wrestling benefit? It certainly looks like Sharon in her Ms Marvel costume. ...

I think you nailed it - Tony Stark's most frequent enemy is Tony Stark. It's just his personality. He over-reaches, over-dreams, over-acts, and then has to dig himself out of the hole.