The first of those questions was partly answered today, in the most unexpected of places - the final pages of Sabretooth #1.
The new mini-series, by Victor LaVelle, Leonard Kirk, Rain Berado & Cory Petit focuses on Sabretooth's time in The Pit for breaking Krakoan Law, and in the closing pages of the issue we discover that he's no longer alone, with Madison one of five mutants appearing.
Kirk's design for Madison, nicely mixes his original Byrne appearance with his signature red jacket, and his more modern X-Club greying temples.
Last seen in the Age of X-Man, what could Madison have done to be in this hell?
His actions in the war?
Something related to his brother, or to Lil?
The Solicitation for #2 reads:
Professor X promised there would be no prisons on Krakoa. Sabretooth was the first in the hole, but now he welcomes five more mutants to his own private hell. What laws did they break? Are they ready for what they’ll find? No. No, they’re not.
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