Your husband might want to use his biopsy material for a Decipher test which will give you all a feel for its aggressiveness. The results are used by doctors to decide treatment. As @jeffmarc said, getting another opinion is important, and you can do a telehealth with a center of excellence.

I too had a 3+4 with an 11.2 psa and chose specifically, a radiation machine with a built in MRI, vs fused images with other radiation machines. What the doctors can see, they can treat. I also felt the treatment parameters with that type of machine exposed less healthy tissue and therefore less side effects. So far so good. I was treated in February of 2023 and had spaceoar inserted.