@Hinscher:
Ichigo is just the son of a shinigami and quincy. Feel like there should be more of them than just Ichigo.
Masaki isn't confirmed to be a Quincy yet (though it's implied in the chapter), and the reason you don't see more Quincy/Shinigami offspring is that….uh, the two groups aren't on friendly terms? And there's few Quincies to begin with, since the genocide.
Fullbring powers are the result of your mom being in a fight with a hollow and surviving, according to wiki, and if you have a shinigami mom or quincy mom that is understandable and should be a given.
That's just it, wouldn't a Quincy mom or Shinigami mom sense the Hollow and dispose it, post-haste? At least with a human mother, chances are they can't see the Hollow coming nor can defend against it.
What is bullshit is not this, but how seemingly everyone of Ichigo's friends have fullbring powers. How did all their mom's fight and survive a Hollow attack?
What "everyone" of Ichigo's friends? It's only Chad and Orihime that have powers, and Kubo only retconned Chad to be a Fullbringer. Ichigo's reiatsu….no, the Hogyoku.....look, the point is they got the powers way after they were born.
And there's nothing in their pasts about a Hollow attacking their mothers. Granted, how would they know?