Posey is averaging 10/5 and has an amazing .636 eFG%. Posey has been one of the most efficient perimeter players in the entire NBA this season.
BBD is averaging 4/3, and is shooting a robust 34.5% (which is also his eFG%, as he doesn't have three point range). He's one of the least efficient offensive "bigs" in the NBA.
If you're going to make a statistical argument, I'd suggest you use a sample size greater than one game. Statistics are based upon averages over time, which should be common sense to anybody capable of reading this blog.
(Again, if you want to compare BBD to somebody of his skill level, Scal is the man. And once again, Scal outproduced the round mound of inefficiency.)