Your AHL team does not have to be all players that you have "rights" to. That's the way it is in real life too. All AHL teams have players that just play in the AHL. Their NHL affiliate can not call them up. They would have to sign a contract with that player. What you're seeing is normal. For instance, the captain for the Bridgeport Sound Tigers is Mark Wotton. He can not play for the Islanders, they would have to sign him to a contract first. He's played there for a while. I don't believe any AHL team is full of prospects.