Observations on the Mid-Season NBA Center Rankings

I recently posted my mid-season NBA center rankings - here are my observations on the rankings:

• I mentioned it briefly in my initial post - I'm surprised at how close Dwight Howard and Al Horford are at the top of the rankings.  Horford trails Howard by only two total points.
• Howard is first in four of the five categories.  The only exception is the Offensive Rating category in which he's 22nd. 
• Tyson Chandler leads that Offensive Rating category and is a very impressive third.  He and Tim Duncan, who was second in 2009-10, are the second level of centers.
• Andrew Bynum, Nene and Joakim Noah represent the third level.
• The biggest positive surprises to me are Chandler, Jeff Foster and JaVale McGee.
• The biggest negative surprises to me are Marc Gasol, Al Jefferson and David Lee.
• Making the biggest jumps from the final 2009-10 rankings are DeAndre Jordan (up 36), Kwame Brown (up 32) and Chandler (up 31).
• Jordan's biggest leap is in the Simple Rating where he was a -7.3 last season but is a 1.4 midway through this season.  He's also already doubled his Estimated Wins Added.
• Chandler has played a big role in Dallas's defensive improvement.  His PER has skyrocketed from 12.58 in 2009-10 to 19.06 so far in 2010-11.  He's already added an estimated 5.3 wins compared to his 1.1 Estimated Wins Added last season.
• Falling the most from the 2009-10 rankings are Jermaine O'Neal (down 35), Brendan Haywood (down 33) and Louis Amundson (down 31).
• Due in large part to his third best Defensive Rating, Omer Asik is the highest ranked rookie.
• The two teams getting the least production from the center position are Phoenix and Cleveland.  The Suns have Channing Frye at 42 and Robin Lopez at 43.  The Cavs have Ryan Hollins at 49.