The NBA Draft Combine is a place for young players to chase their dreams. It’s also, along with NBA Summer League, the premier destination for league gossip, with executives from all 30 teams, coaches and agents gathering in the same location. A prominent topic of conversation this week has been Zach LaVine’s future. Opinion — some of it educated, some of it guesswork — is varied on what the Chicago Bulls’ two-time All-Star guard will do when he hits unrestricted free agency on July 1. But this much is certain: His return to the Bulls no longer is considered the slam dunk it once was.