I think that you are mixing my case with somebody else's , but that is OK .
My husband's 3+3 became 4+3 over time - same lesion in question was 3+3 10 years ago.
Anyhow, my husband had PSMA and all other tests necessary, all contained in a gland and both radiation oncologist and robotic surgeon in center of excellence agreed that for my husband RP is the best way going forward and they both mentioned "cure" since he has only one core of 4+3 out of 14 biposy cores taken.
Because he has cribriform cells and IDC in that one core, the best course is to have RP. That way if he ever has recurrence he will have an option of having radiation. You can have one area radiated only ONCE. We wish to have back-up plan if it is ever needed.
BTW, radiation can cause multiple side effects, some are immediate and some appear over time ( even years down the road). Basically - there is no procedure that does not have possible side effects. Some people have them, some don't.
For us the main goal is getting rid of the cancer, side effects will be there or not be there - that is out of our control and they will be dealt with IF they happen to be there.
Just a thought based on my family's experience- my grandad had his prostate removed at age 71, he didn't have cancer, but as his wise urologist said-if something's becoming a problem it's best to remove it before it becomes a bigger problem. He was one month and 14 days away from being 100 years old when he died (and his death had nothing to do with cancer, he died from kidney failure after being prescribed wrong hypertension medication). His brother also had his prostate removed-he died at age 96 from stroke. And my father had a really lousy urologist who first did a TURP for benign enlargement (on MRI, SCAN, biopsy, just based on his PSA level-4 at the time), after which he deemed my father cured?! and told him to check his PSA once a year!? Well, you know how it ended.. I wish he had his prostate removed back in 2016, he would still be here today...
Anyway-best of luck to your husband, hope he gets to be a 100 like my grandad!❤️