I decided to get another cat so Emmett would have a friend. I hope things work out once they are used to each other. Emmett doesn't seem happy about the whole thing.
Amazingly it only took about 2 days. There is still a little hissing now and again from Emmett, but over all they seem to like each other. I think I'll keep him
Things didn't work out. Emmett started using the tub as a litter box and he stopped eating for a bit. Rocky has left today. He was a nice cat, but he's going to a new home now.