Chicago Bulls changed for the better?

Have the Bulls improved enough to beat the Heat? (PER Diem: Feb. 29, 2012)

Updated: February 29, 2012, 3:13 PM ET
By John Hollinger |

This year's Bulls look just like last year's Bulls, right? Good enough to beat everybody except Miami with their grit and energy, but too dependent on a single star to break through. Right?

Um, not so fast. A lot more has changed here than meets the eye, and it's been among the season's most underrated stories.