There are mixed sentiments inside the Heat about whether to sign Stephon Marbury, 31, if he's cut by the Knicks, which Newsday (N.Y.) reported is imminent. The Heat is definitely intrigued and would consider Marbury, but has concerns. ''With Steph, it's all about him,'' one Western Conference executive said. ''But I'd rather have the ball in his hands than Chris Quinn's, Mario Chalmers' or Marcus Banks'.'' . . . Miami declined Indiana's overtures on Jamaal Tinsley (three years, $21 million left on his contract), but would consider if he's cut
