I'm more interested in what happened to Blink? Though I assume this Nocturne is the 616 Blink
The Exiles have jumped into Earth 616 three times. The first time involved Havok I think. It was when Austen was writing both books. The second time it was the modified House of M reality, the third time they were in 616 but landed on Counter Earth.
The theory Beast puts out there is similar to the Legion of Superheroes idea tossed out in Final Crisis for the reason the Time Trapper keeps changing identities.