By Evan Bleier If you can’t beat ’em, join ’em, again. That may end up being the case with Kevin Durant as the NBA superstar appears to be at risk of being dealt to the Celtics from the Brooklyn Nets for Boston forward Jaylen Brown and a yet-to-be-determined package of players and assets. For Durant, who lost to the Celtics in the first round of the playoffs despite the Nets being favored to start the series. this would be history repeating itself again as he infamously left the Thunder for the Warriors after Oklahoma City was bounced from the playoffs by Golden State. In this instance, Durant…