Unless i'm blind, which could be the case, according to this video http://www.youtube.com/watch?v=YCYDr6LsRu8
Hazama does not get chain meter back on block. Maybe it has to be 0 for him to gain 1 back? I dunno. He has 1, Hakumen blocks a chain and he still has 1.
Edit: And Hazama only gains one chain back on hit, not 2.
Edit again: Hazama only gains one chain on block if he's at 0.