Hi, I am just posting this thread on head canon on Sam Alexander's Nova.

1. Sam is actually half-human, half-alien based on Titus' calling the humans as "these humans" instead of "[Sam's dad] kind" that got me thinking if Jesse was actually humanoid alien who went native as a teenage Corpsman. But that might be deus ex machina and stupid since High Evolutionary would have discovered it (and possibly calling Sam as "[alien]-Human Crossblood" and even more genetic potential on his experiments) or why his colleagues called his dad Jesse instead of original alien name. Not to mention his mom and service records.

2. Sam might inherit Novaforce from Jesse Alexander since either based on (1) if he's Xandarian or long time serving in Nova Corps. There was old stories where Richard Rider still have Nova force inside of him despite Xandar was destroyed by Nebula and Garthan Saal went insane from Nova Force during his appearance in New Warriors. Not to mention, Spiderman: Reign and Spider Island storyline where Peter Parker has "body fluids" that contained carcinogen for Reign and spider epidemic vaccine for Spider Island.

3. Richard Rider's Novaforce Ghost (he's dead but they didn't mention ghosts) possessing Blacknova helmet or Rob Rider is hiding among remote Xandarian colony with newly built computer. or "Wild Winds of Nova Force" (Novaforce is returning to the universe as natural force that can only be tapped through specific tools).