Benefit of greylisting

I use DCC indirectly in a filter chain beginning with MIMEDefang.  I'm 
not sure how I can start using greylisting in this kind of a setup.  As 
greylisting involves rejecting email, and in this setup DCC can't 
expliticly reject an email (only contribute to a final score), I don't 
see how this could work.  Is greylisting even worth attempting in this 
setup?


--Aaron