NEW YORK, NY – OCTOBER 31: Head coach Fred Hoiberg and Rajon Rondo #9 of the Chicago Bulls talk on the sideline during the second half at Barclays Center on October 31, 2016 in New York City. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Michael Reaves/Getty Images)

Rajon Rondo’s absence has exposed a major weakness, and Boston is exploiting it