Deron Williams stayed. Jason Kidd left. Steve Nash was traded, and so was Kyle Lowry. Thus far, the NBA’s free agency season has been dominated by point guards, but as we count down the days to the end of the moratorium on July 11, there are plenty of other deals, signings, and trades being made. On Friday, the Celtics were dealt a crushing blow (exactly how crushing will be determined in part by Jason Terry) when Ray Allen decided to join the Miami Heat.