Brinkworth played two seasons with Knightley and Kitchen. His last year was '63-64, while theirs was '64-65.
Brinkworth had graduated before I enrolled at RPI, but I had the opportunity to see him play for RPI while I was in high school in the Troy area. He was, indeed, a fine player, scoring between 70 and 75 points in each of his three years, almost exactly evenly divided between goals and assists.
He went on to play several seasons in the AHL and was a 20-goal scorer at a time when a 20-goal season in the AHL was a pretty significant achievement. It's certainly reasonable to believe that he could have played in the NHL if there had been 30 NHL teams in existence, as there are today, instead of 12, as there were back then.
I got to see him play once as a professional during the late '60's, but his participation was very limited the night I was there. He was playing for the Baltimore Clippers against the Springfield Kings in an AHL game in Springfield. Bobby hadn't been in the game 30 seconds before he got in a fight, and that was the end of his participation for the evening. Very uncharacteristic of him, since his relatively small stature generally precluded his getting involved in many fights.