Synonym for "follow-up" meaning the most experienced waiter as a noun

I used to work for a restaurant that had waiter teams. There were three roles: Aid, Lead, and Follow-up.

• The Aid was basically the busboy.
• The Lead greeted the customers, took the drink orders, got the drinks, and took the food orders (most of the time).
• The Aid and Lead were often out of sight to the customers, getting stuff outside the section.
• The Follow-up handled the flow of the service, quality control, customer relations, and getting paid. The Follow-up never left the section, and was usually the most experienced waiter. Described here it sounds stilted, but it wasn’t: it worked very well.

I am looking for a word to replace “follow-up” that is more elegant to hear and see, and that reflects the seniority and sophistication of the role.