Deron Williams will be coming back to Dallas on a one-year deal worth $10 million, filling a major need at point guard after the Mavericks missed out on Mike Conley and keeping free agency hopes alive for next summer. This is a great move for Dallas at a very reasonable price.
Obviously, the Mavericks' summer hasn't happened as planned. They met with three free agents on July 1 and missed all three, heart-breakingly losing out on Hassan Whiteside after it briefly seemed they were in the lead. After that, Dallas chose not to do anything as free agents signed all around them. Bringing Williams back was mostly necessity, especially since the Dallas native wanted to return.
Williams is a good enough point guard when healthy, which is always the biggest adventure with him. He's frustratingly inconsistent at times and will go through stretches where he misses all sorts of open looks, but he was one of the best crunch time players in the NBA last season, something that directly won Dallas several games. He's also very good with the ball in his hands, rarely turning it over with a good number of assists. For Carlisle, a notoriously hard coach on point guards, Williams is perfect. He'll run plays Carlisle calls and get out of the way when he needs to just spot up off the ball.
This is clearly another stopgap deal, as the Mavericks want to be real players in next summer's free agency as well. Williams on a one-year deal paves the way for that, as Dallas can try their best to win this year and still target an upgrade at point guard. Although Williams surely would have preferred some long-term financial security, he is still getting paid by the Nets next season. Ultimately, this is a move that benefits both parties.