First year I can see GS struggling against teams with size. Lowry is killing them in the PnR because they don't have the personnel and right now or the discipline to defend it.
Zaza and McGee helped just for the fact they covered ground. They don't have that at all right now.
After Boogie leaves they are going to need a legit center. Toronto, Philly, Denver, Houston (despite their struggles) etc with talented bigs and rim runners are going to give them fits.