Oh,that's no kidding! I watched a family of raccoons come up out of a storm drain - in downtown Denver. Just because you haven't seen anything besides cats doesn't mean they aren't out there, and although your Silkie rooster has chased off cats doesn't mean he can fend off other things, like stray dogs, raccoons, owls, etc. He's more likely to become the first course, followed by your hen for dessert. If they don't like the coop, I'd be looking into the "why"....is it too dark? Is it damp? Are there mites or mice in there? Is it too small?
x2!! But I think rather than feeding layer, I'd go with All Flock or Starter/Grower at first for the slightly higher protein. She does indeed need calcium to produce good eggs, but that can be provided in the form of a little dish of oyster shell fed free choice. Your roo doesn't need the extra calcium in layer feed, and since you only have the two of them it would be silly to buy two different kind of food and try to feed them separately. Since all they've been getting is scratch and scraps, I'd want that higher protein to build them up a bit from that diet.
