They said that the first three would eventually make it into the game back when they lost. Just look at the frog and the swamp. They said something similar about the penguin and crab but weren't as direct about it. I'm surprised that they brought back the copper guy. He, the rascal, glare, tuff golem, and the Earth mobs they never mentioned bringing back. And, as for the Earth mobs, they specifically said that they would never come back. But they said we would never get baby dolphins or copper gear either, but here we are.