Prior to the 1966–67 NBA season, the friendly but unassertive Schayes was replaced by a familiar face, the crafty but firm Alex Hannum. In what Cherry calls a tumultuous locker room meeting, Hannum addressed several key issues he observed during the last season, several of them putting Chamberlain in an unfavorable light. Sixers forward Chet Walker testified that on several occasions, players had to pull Chamberlain and Hannum apart to prevent a fistfight. Fellow forward Billy Cunningham observed that Hannum "never backed down" and "showed who was the boss". By doing this, he won Chamberlain's respect. When emotions cooled off, Hannum pointed out to Chamberlain that he was on the same page in trying to win a title; but to pull this off, he – like his teammates – had to "act like a man" both on and off the court. Concerning basketball, he persuaded him to change his style of play. Loaded with several other players who could score, such as future Hall-of-Famers Hal Greer and newcomer Billy Cunningham, Hannum wanted Chamberlain to concentrate more on defense.