User blog comment:The Many-Angled One/A Long Awaited Return.../@comment-16461120-20160423094223

I'm confident that it's Richard Rider and here's why I think that:

Nova used a Cosmic Cube to send Drax and Star-Lord to Earth-616, before it ultimately shattered, stranding him in the Cancerverse.

S.H.I.E.L.D. found pieces of a shattered Cosmic Cube and it became Kobik.

Kobik is the reason for Avengers: Standoff!