Castillo is not million miles away from fighters like Cuevas or Palomino. He's a good champion. Hearns beats him decisively, but the terms you're describing the scale of the mismatch in are belittling to a very good fighter, IMO (even if it's in reaction to agenda driven gibberish on the other side).
cuevas died, castillo dies Palomino was very durable, but I suspect he too would have been hammered into defeat within 5 or 6