Because Hansen made his decision after careful consideration, by that time most free agents had already reached agreements with other teams, leaving the Kings with limited choices from the remaining players.
McGee has some issues, but he's talented and only 30, so he's still sufficient as a backup.
However, it was during this time that a major problem arose for the Kings.
That summer, Hansen's decision was the most closely watched event, but besides this, there was another issue equally as intense.
After Leonard was injured by Pachulia's undercutting, his injury condition became recurrent, which led to a significant rift between him and the Spurs' management regarding this injury.
Leonard's contract was set to expire next summer, and due to concerns over his injuries, or perhaps out of team tradition, the Spurs wanted Leonard to accept a contract extension below the maximum salary.