It is very difficult with any Gleason grade of PC to know if it is still contained in the prostate without a surgery pathology. Bone scans can determine if there are any mets in the bones but can still be inconclusive. Even a G6 grade can escape the capsule and spread, but it is much rarer than with higher grades. A pathology report after surgery is the best way to determine if the tumor has spread and what the Gleason score actually is throughout the tumor. In some cases the Gleason is downgraded with the pathology report. As you have seen there are a lot of G8 & 9 guys here who had great outcomes with surgery and organ contained pathologies.
As you reported in another thread your URO was not helpful at all with his short 10 minute consult and as many here recommended you need to fire him. If your husbands GP says he is healthy enough for surgery he should be more on top of his condition and health than the URO. With the Australian health system you may have limitations on URO choices but that is another subject to deal with. We have several active Aussie members and hopefully they will connect with you for more advice.
AGE 61 Dx with fam hist of PC
3.5 12/10 ref URO
5.25 2/11 DRE Neg
BX 4/13/11 2 of 12 cores diag both sides 15% & 20% GS7(3+4)
RALP nerve-sparing 6/8/11 path G7 pT2C, Marg-Lymph-Sem-Vas-PNI- organ confined 60% tumor involved 69grms 4.3X4X3 cm
100% dry 7/3/11
TRIMIX therapy for ED seeing improvement