Kim, I'm so sorry to now hear that Pouncer probably has crystals again too.
I also learned the hard way with Storm. Even though Storm had to have the PU surgery, he can still become irritated by crystals or get UTI's. I thought that his problems were being caused by all the stress he had when I still had Cirrus so I switched the cats food to Innova. After several months, Storm began licking himself a lot and he was also bloody in his pee pee area. His urinalysis showed that he had crystals but not an infection so I had to start feeding him his special diet again. Now all of my furkids are on Royal Canin Urinary S/O formula and Storm has been a happy healthy boy ever since. Good luck at the vets and I hope that both Allen and Pouncer will feel better soon. Please take care too. (((HUGS)))