The Brooklyn Nets are about reaching the point in their rebuild when they'd like the arrow to start pointing up.Mikel Brown Jr. is pretty much holding that arrow in his hand, possessing the most control over where the path goes from here.Brown was the No. 6 overall pick out of the University of Louisville in the 2026 NBA Draft.He's a top-notch point guard prospect, capable of throwing dimes as well as draining deep 3-pointers.There's just one worry: his back.MORE: Bronny James' best future doesn't involve a trade from LakersBrown missed chunks of Louisville's season, including the NCAA Tournament, because his back wouldn't stay comfortable.If that injury persists, there's trouble.If it goes away, Brown can be a star.NBA Summer League begins this week, and it's the first chance to really se