The Heat signed three of the best players in the L this summer, and the Celtics responded by getting a couple of guys whose best days are well behind them. So, improvement? The C’s seem to think so. CSN reports: “When the final horn sounded in Boston’s Game Seven loss to the Los Angeles Lakers in the NBA Finals, Celtics co-owner Wyc Grousbeck immediately began thinking about next season. He saw a need to get more size, to be more physical. And then . . . the Miami Heat reloaded with what might be the most devastating 1-2-3 punch the NBA has seen in years, adding LeBron James and Chris Bosh to perennial all-star Dwyane Wade. ‘We were already going to try and get better, get tougher,’ Grousbeck told CSNNE.com. ‘But then the Miami thing just took it to a new level.’ Since then, Boston has gone from a team that clearly struggled on the boards, to one having arguably the deepest frontcourt in the league which will be led by Kevin Garnett, Jermaine O’Neal, Shaquille O’Neal and Glen Davis …  Although Shaquille O’Neal’s plea to Rivers to be a Celtic via texting and later, a visit to Rivers’ home, was instrumental, Grousbeck has had his eye on landing O’Neal dating back to . . . you got it, the NBA Finals’ loss to the Lakers. After the game, Finals MVP Kobe Bryant talked glowingly about how important it was for him to have one more championship ring than Shaquille O’Neal. ‘The minute I heard Kobe’s remarks about having one more ring than Shaq,’ Grousbeck said, ‘I said to Danny, ‘Go get Shaq!’ . . . and here it is.’”