I am by no means an expert or even close to one but I was daagnosed with Gleason 3+3 at biopsy and Stage T1c with a PSA of 3.2 at age 58. Biopsy showed 7 of 12 samples showed 5%-40%.
The pathology report came back with Gleason upgraded to 3+4 but with clear margins. They did note though that the surgeon had taken a little more out around the prostate and that the cancer was just on the verge of escaping the gland.
So can a 6 be of concern to bigger issues? Normally, from all of my reading, my answer would be not likely. But yet, I almost crossed that threashold. So my message would be not to worry about it too much until you get the pathology report (assuming you have surgery) and then take the next steps as necessary.