Rasheed Wallace’s camp was expecting calls early Wednesday from the Celtics, Cavaliers, and Spurs, among others. Kevin Garnett, a league source confirmed, was working behind the scenes to recruit ‘Sheed to Boston. Wallace’s attitude – which obviously can be both good and bad – and his ability to stretch the front court would be assets to the Cavs in their quest to fortify their pre-draft acquisition of Shaquille O’Neal. Wallace will have to factor in whether anyone comes forward with more than the mid-level exception. He also is said to be wary of the strong egos in the Boston locker room, not to mention the fact that the Rajon Rondo situation needs to be resolved. The Celtics cleared a spot for Wallace by not extending a qualifying offer to power forward Leon Powe, who is coming off major knee surgery and became an unrestricted free agent.