Shortly after the Celtics learned Rajon Rondo was lost for the season, reality set in: They would need to change — fast. Without a point guard who dominated the ball, the Celtics required someone to steer the offense. But instead of giving that responsibility to one player, they gave it to several — consolidation, as Kevin Garnett has repeatedly said. This teamwide involvement helped others who didn’t handle the ball get into a rhythm during games. Key examples are Leandro Barbosa, Jason Terry, Jeff Green, and Courtney Lee, who combined are averaging 13 more points per game in the last six games (all wins) since Rondo, who was averaging about 14 points himself, went down. It has also meant more minutes for players whose roles weren’t as defined.