KG did take a lot more interior shots in Game 4. He just didn't make them. He, and all of the Celtics, were putting up softies inside and missing at a ridiculous rate. KG ends up taking a lot of "mini-jumpers" from 3 feet away instead of going up strong.
Don't really agree with you on this one. KG did go strong in Game 3. He took 8 of his 19 shots from inside 5 feet, making 7 of 8 (3 layups, 3 dunks, 1 putback, missed a layup). He made 1 of 3 from 5-10 feet and 3 of 8 from outside 10 feet. He also went to the line 6 times, hitting 10 of 11 free throws. All told, he went inside and got 32 points on 19 field goal attempts.
In Game 4, KG took only 5 of his 21 shots inside 5 feet, making 2 of them. He had one blocked by Smith late in the game and missed a couple of putbacks. He took 11 of his shots from outside 10 feet and only hit 4 of them. His two made shots in the last 3 minutes were from 7 and 9 feet - not quite inside scoring but better than the 12 to 21 footers he wasn't hitting consistently. He also only went to the line twice, making 2 of 4 free throws. So, he stayed outside and had 20 points on 21 field goal attempts.
Math seems pretty simple to me - if he goes inside he converts more and at a higher rate. Maybe he was scared off by Smith blocking his teammates' shots, but if KG gets intimidated, that's a bad sign for our team all around. The more he stays inside, the more he'll abuse the Hawks and the easier we'll win.