At least one analysis doesn't agree with your complete assessment of his post moves. The dunking yes. The post....not so much.
http://www.grantland.com/story/_/id/7529141/person-interest-los-angeles-clippers-blake-griffin
<h3>Blake in the Post</h3>
The shortcomings in Griffin's post game come from his college days,
when, as Oklahoma's center, he racked up numbers by outmuscling and
outjumping opponents. In the pros, two truths about Griffin have been
exposed: (1) he's not 6-foot-10, and (2) he plays
too
physically. When you watch Griffin over several possessions, you begin
to see the influence of all those highlight reels and the confidence of a
young player who understands, and perhaps overvalues, his athleticism.
Tim Duncan can create space by clearing his elbows and squaring up to
the basket. Griffin, mostly because he's shorter than many NBA power
forwards, tends to get smothered when he faces up. He's an excellent
ball handler for his size, so you'd expect him to blow by his defender
and get to the rim. The reality is a lot clunkier.</p>
On about half of his possessions in the post, Griffin pivots and
faces up to the rim. He almost never goes directly into a move. Instead,
he robotically sets his feet and squares his shoulders. From that
position, he either tries to blow by the defender, or, if he's on the
right block, he spins left and attempts a bank shot. If the defender
stays in front of him, Griffin turns into basketball's version of Dwight
Freeney — spinning, spinning, and spinning until he can create
separation. And when he finally gets that space, he, too often, goes
into something called …</p>
The Clunkin' Duncan. This dance goes like this: You bash your
shoulder into your partner's chest, spin, bash your shoulder into his
chest again, spin, and lose your balance. As you fall backward, you toss
the ball up off the backboard and yell that you've been fouled.</p>
Blake's reliance on the Clunkin' Duncan comes from his desire to
impose his strength and athleticism on defenders. This strategy worked
in the Big 12, but it doesn't work when Blake tries to bowl over gully
NBA veterans like Nazr Mohammed.</p>