The most likely reason is that the member did not have any activity for the month that would trigger a statement, based on the CU's configuration.  Most credit unions have their statement configuration set up to print a monthly statement only if the member has a checking account, and only if there is activity on that account, saving postage costs on months when there is no activity.  You can verify this by viewing his Share Draft Transaction Inquiry in Phone Operator, then compare that to your credit union's settings for when statements are produced using Tool # 961 "View Reg. E Triggers for Statements."