I just read this thread and the previous one about Fatty and you have really worked hard on this guy's behalf! I'm so glad to hear that you were able to get him to the vet and that you received donations from PT'rs to help make it happen. I will try and put something towards future stuff for Fatty and Pretty girl next month if you need it at that time. That was quite a story to read how Pretty Girl was waiting for him and then greeted him with so much affection when he got back. So sweet! She was probably pretty worried that night when he wasn't around and wondered what had happened to him.
I was so relieved to read that you are planning to try and find them a home together. They are each other's family. She is lovely and looks like a tortie/tabby cross?
I hope giving the meds just once a day will be enough for Fatty. Maybe you could call the vet and ask what kind of results this will produce? I don't know very much about hyperthyroidism so I don't have any advice on this but I'm sure the vet could tell you if it would be effective or not to give the meds once per day.
If it's not, do you think that Fatty and Pretty girl could temporarily reside at your house until a home for them is found? It sounds like you've got your hands full with Athena and his upcoming surgery but maybe after things settle down in a month or so? It may not work at all but I read in one of your posts that you were considering it and it might be the best way to make sure this guy gets his meds twice a day and puts on some weight and begins to get healthy and having Pretty Girl with him might help him to adjust. He will be more adoptable if he's in better condition as well. She probably needs to be spayed, dewormed and deflead as well before she is adopted. I would like to contribute to that if you are able to line it up.
Anyway, just wanted to post and say that I think you are wonderful for taking care of these two cats and all the animals that cross your path who are in need.