Big Baby used Media Day as an opportunity to bring up concerns about his role on the Celtics. The Boston Herald reports: Glen Davis‘ versatility has been utilized by the Celtics during his three seasons. But entering his fourth year, Davis is pining for a solidified role. ‘It’s difficult because as a player you kind of don’t understand where they’re going or what they’re doing,’ Davis said this afternoon at media day. ‘No mater what I do, I can play great, it’s still not enough.’ Davis says his role has changed every season he’s been with the team. He excelled as a pick-and-pop power forward during his second season (2008-09) when Kevin Garnett missed the playoffs with a knee injury. Davis was a restricted free agent that summer, but was unable to turn his postseason success into a starting job with a new team. Instead, Davis re-signed with the C’s for two years. When last season began, Garnett was healthy and Rasheed Wallace had signed to fill the role of floor-stretching power forward, forcing Davis to play inside more. Wallace retired after the season and the C’s acquired a pair of centers — Shaquille O’Neal and Jermaine O’Neal — to fortify the front line. ‘I have to find out what my role is this year,’ Davis said. \With Rasheed last year, I had to become a center. Now, I don’t know. Do I become a 4 now? Do I go back to playing the 4? We’ll see.’ With training camp beginning tomorrow, Davis is hoping for an answer about his role. ‘It’s going to go through some ups and downs with me and Doc (Rivers), but that’s what it is,’ Davis said. \As long as I find out what my role is, I’m going to do my role and that’s it.’”