He and Bleddyn Williams, who was regarded as the prince of Welsh centres, were lifelong friends, and Williams (who died in 2009) said of his partner: “Everybody knows how tough he was, but I played countless games with him and he was a beautiful passer, bloody quick, and a magnificent captain. As a player he was selfless".
“We used to run a lot of scissor moves — I always started with the ball and he always cut the angle. The first time I would feed Jack and he would get smashed. The second time I would feed him and he would get roughed up again. He would wink at me as he got up: 'You know what to do now, Bledd.’ And the third time I would throw the dummy. He would get hit by two or three hard cases and I would saunter off to score under the posts and get all the glory and headlines – but they were Jack’s tries really”.