He does have a job that the waiters don't , it is his responsiblily to take the pass. manifest and do the table seating arrangements. He also oversees the staffing for each shift etc. BUT< that is HIS job and one that he is PAID for at a higher rate then the waiters. So, unless he does an extra service for us personally we don't tip him.
We don't guilt tip, although I realize some do, we did on our first cruise, we don't now.