By Dan Gartland The NBA’s best team could be without its best player. Good morning, I’m Dan Gartland. I’m hoping Devin Booker’s injury isn’t too serious. If you’re reading this on SI.com, you can sign up to get this free newsletter in your inbox each weekday at SI.com/newsletters. The NBA’s best team could be without its best playerDuring the first half of last night’s Game 2 between the Suns and Pelicans, it was easy to start envisioning Phoenix’s return to the Finals. Devin Booker was on fire during the first two quarters, scoring 31 points on 12-of-18 shooting. But midway through the third …