I re-watched the game and it was mindbogglingly how terrible a defensive tandem Bass and Wilcox are. They don't communicate at all. On one possession, the Bulls ran a stagger screen and Bass, Rondo and Wilcox ended up triple teaming Nate on the wing. Triple Teaming! Who does that. Well, Bass, Wilcox and Rondo, that's who. By the time Bass realized his own man was nowhere to be found, Nate passed the ball to a wide open Boozer who put in an easy layup.
On the next possession, the Bulls of course ran the same play again and this time, there was better communication. The only problem was Bass sunk himself into an unintentional quadruple screen and Boozer simply got loose for an open jumper. Boozer didn't smile but he had to be smirking inside, toying with Bass as he was. On the next possession, the Bulls again ran the same play and being the professionals they are, the Celtics finally defended it well. Boozer again tried to trick Bass into another quadruple screen but no, Bass wasn't having any of it. They would not be tricked three times, the defensive monsters.
The new guys, Lee, Barbosa and Terry are big culprits in the poor defense. One time Barbosa needlessly sunk in from the corner far too deep and left Butler wide open for a three which he hit. It was so sloppy. Doc called for Lee immediately after it happened. After seeing Lee's team defense, the substitution wouldn't have improved things. I'm most disappointed in Lee frankly because he at least came in with a good defensive rep. Individually, I think he's a good defender but boy does he make some curious choices on team defense. On one play, while marking Butler, he anticipated a pass going to Noah and shot in for a steal, straying about 15 feet from Butler. When no pass came, instead of going back to Butler, he doubled down on his gamble and started trying to double team Deng out beyond the three point line. This all resulted in Butler being left wide open for an offensive putback. With no other defensive switches to be found, Lee was near the three point line while Butler tipped in an errant shot. I couldn't believe what I saw.
A huge defensive problem is how long the Celtics trap on defense the pick and roll. Bass and Wilcox will trap and stay for seemingly forever. Then it seems like a light goes on, why yes, they were guarding someone else, someone much taller, which sets off a mad scramble to get back to their man. It's a frantic scrambling borne of bad timing and inattentiveness and the defense can't recover.
KG had some defensive slip ups but it's amazing how much better he is at anticipating the offensive sequence and deterring passes from even being attempted.