It MIGHT also be slate, sort of smearing the pattern (and sometimes making reds look more purple) and making the beak/skin lighter. I see it's a cockbird too, with that blue fleck on its tail. That means it's split for blue.
Your grizzles are so cute!
And that is a blue velvet (also called dark check, or t-pattern), not spread. Spread makes a blue pigeon completely black, to where you're not supposed to be able to see the tail bar or wing bars