Rumblings about Ray Allen being on his way out of Boston are accurate, but only if the Celtics can get back a player who’d crack the top eight in their rotation. One scenario that has been discussed would have Allen going to Chicago for Kirk Hinrich and another piece – John Salmons? – to satisfy the salary requirements. If it came to fruition, what an intriguing swap it would be for teams that waged such a thrilling postseason battle only eight months ago. Since Allen’s $19.7 million contract expires after the season, acquiring him would leave Chicago flush with cap space for a 2010 free-agent binge centered around Chicago native Dwyane Wade and an additional superstar.