Dribbles: Cavs’ first audition brings positives, but rebounding needs work

CLEVELAND — Random dribbles from the Cavaliers’ 124-113 preseason-opening loss to the Celtics on Thursday. 1. It wasn’t often pretty, but that’s what this time of year is for. It’s to figure out some things. 2. So what did Cavs coach Kenny Atkinson figure out? Well, he didn’t specifically say any of this, but I bet he discovered that Peyton Watson as the starting small forward is a pretty good idea. And hey, maybe the Cavs have something in rookie Meleek Thomas. 3. At least, that’s what I left thinking. Let’s start with Watson. He arrived with the promise of…