I do think it is possible for Griffin to become a good man defender as I think I alluded to in my post. I would also agree it is possible for a player to improve on something they did not do as a collegian. The question shouldn't be, in my opinion, one of possibility but one of probability. Taking a glance at both the list for blocks per game and blocks per 48 minutes lists I didn't see an analogue for Griffin. The closest might be Tyrus Thomas who is 12th in blocks per game, but his skills as a shot-blocker manifested themselves at the college level.
I agree Griffin has a chance of being a solid individual defender, he has the quickness and strength if not yet the desire, to compete man to man. But. . .
The best shot-blockers are guys who have elite size and/ or athleticism. The shortest guy on the NBA top ten list is 6"10. Yes, maybe Griffin becomes the exception, however I stand by my statement that the odds are against him suddenly acquiring that skill, and that expecting him to suddenly develop a talent that he has yet to show--a talent that correlates to a physical attribute (height) he does not possess-- is rooted more in wishful thinking than it is a reasonable expectation.
As for Hawes being a better shot-blocker than projected; first of all, unlike Griffin, he is a seven footer, and second I recall him being projected as an adequate shot-blocker; he averaged 1.7 blocks per game as a freshman in college and now averages 1.3 as a pro, behind D-Wade and some guy named James. Also, not to be needlessly critical of Hawes, but I believe the ineptness of our other bigs at shot-blocking as well as the sieve that is our guard defense makes him appear better at that aspect of the game than he probably is.
I suspect some might read this post as an attack Griffin but that is not my intention. Their doesn't seem to be an obvious guy to pick over him and if we take him he has my support 100%. But it seems unfair to me to expect something from a guy which he has not yet shown. If we take Rubio I am not expecting brilliant shooting; if we take Thabeet I am not expecting complicated post moves; and if we take Griffiin I am not expecting much defense in the short term or shot-blocking in the longterm. Hopefully guys do improve, but it is a recipe for disappointment for fans, and unfair to the players themselves to expect them to be other than what the evidence thus far points toward.