By Brett DawsonIn Oklahoma City on Thursday, Thunder general manager Sam Presti led a group of front-office personnel that worked into the late hours of NBA Draft night. Halfway across the country, some other Thunder staffers were living it up at a surprise birthday for Paul George. It’s part of continued communication between George — who can opt out of the final year of his contract on July 1 and become a free agent — and the team that traded for him last summer.