I'm not sure where you got the idea that defense was totally prohibited. Please see the existing thread "Defense, It's still here"
http://www.chiefdelphi.com/forums/sh...ad.php?t=61047 Note the quote from the GDC Q&A about defense being allowed.
At the Detroit Regional, the top penalties called were <G22>, <G42> and <G37>. 42 and 37 can both be considered anti-defense rules, or maybe more properly, defense-limiting rules.