Robinson doesn't get that much credit only because he was only around for 5 years out of the 22 years for the streak. Duncan was around the longest for the streak which was 19 out of the 22. So of course he will be the one associated with it the most which he should considering the Spurs wouldn't have made it to the playoffs without him during the stretch of '01-'04. That 3 year stretch the Spurs really rode him hard while Parker and Manu were still developing into stars but weren't establish yet.