Photo by Michael Reaves/Getty Images Brad Stevens, Boston Celtics After a turbulent start to the offseason, the Boston Celtics dipped into the free agent market and landed a name you might not expect: Luka Garza . With their hands tied by the luxury tax and a roster overhaul well underway, Boston is taking a flier on Garza’s upside—and they may well be rewarded. The Celtics’ two free agency signings—Garza and Josh Minott — spoke to reporters for the first time as Celtics during halftime of the