They totally dropped the Captain Marvel being the Warden of Prison 42 idea. Without any mention whatsoever actually. Probably since Paul Jenkins set up this status quo then didn’t write the character again (weirdly enough, at the same time, Zeb Wells made Noh-Varr the “Warden” of the Cube prison.)
I’m sure there’s an untold story to explain that could be done and I’ve always thought the Skrull had bags of underutilized potential. Plus with the prison being in the Negative Zone, it could be tied into the (then) current DnA Cosmicscape, post-Annihilation. I also wonder who replaced “Mar-Vell” as Warden. We never see in the issues when Blastaar assaults the prison during War of Kings. There’s a few characters that could work; I think I’d like to imagine Blue Shield.
I also wonder if Paul Jenkins ever knew this was a Skrull when he brought him back? Or if that’s the impetus for him not writing anymore stories with him?
Speaking of resurrecting Captain Marvel’s, he had the wimpiest death which would be quite easy to just say “he got better” from.