I get what your saying about Skaar, when you look at the situation with Reed and Sue having a mutant son when both are technically human. The whole having a kid thing in marvel is hit and miss. They have their hits Cable, Scarlet Witch, Skaar, Daken, Rogue and than they have those confusing ones like Nightcrawler, Stryfe, and Lyra that may be good but are quite confusing to understand.

if nightcrawler was wolverines son not much would change really i mean nightcrawler probably be more willing to kill and have a animalistic rage and based on logan's popularity kurt would have the claws.
well the hulk fucked caiera not banner so yes skaar is either a new species or a mutant