So it's about money. Z's made about 100k with the Sabres thus far, and is eligible for some perfromance bonuses (not sure what they are). Maybe the Sabres are keeping him on the roster so he can earn NHL dollars to offset the KHL money he is forfeiting. There may be some deal with GMTM and Z's agent to keep him up with the big club for so long, let him earn some cash, and then Z will sign his transfer agreement to go back to the OHL.