He went back to the ABL and was again the league's scoring leader, returned to the Celtics for another season, then settled down for a while with the Ft. Wayne Zollner Pistons of the National Basketball League in 1941. From 1941-46 he was at his peak. He improved his shot and for the first time, his free throw percentage rose near or around 80%. He continued to get more accurate and dangerous while keeping his legendary range. The Pistons won over 80% of their games and made five consecutive NBL finals appearances. They won NBL titles in 1944 and 1945, as well as the World Professional Basketball Tournament in Chicago.