Di341: Sorry about your significant other. Its scary. It helps emotionally to be prepared given his initial diagnosis in 2019. Try and get backup diagnoses from as many people as you can, including outside your treating hospital. I went to 6 radiation oncologists 4 of them in centers of excellence and the treatment recommendations were slightly different. There are some grey areas in the Dr's process so collaborative patient/significant other involvement is important. I myself started out with Gleason of 3+3 and had 5 radiation treatments in February. Here are some of the places and reasons I looked them up:

Nccn.org
Many doctors follow their guidelines, and it is there for doctors and patients
Decipherbio.com
Takes a slice of the biopsy which helps evaluate aggressiveness and modes of treatments (acts as a backup)
Viewray.com
MRI/Radiation machine combination unit (this is what I ended up using)
Mevian.com
Proton therapy radiation machine
Globalroboticsinsititute.com
A doctor Patel, I looked into when I was considering prostate removal in Celebration Fl. with 18,000 prostate removals.
pcri.org (some on this web site have recommended with lots of dr videos).The Prostate Cancer Research Institute helps men and caregivers research their prostate cancer treatment options.