On
DCL, the amount designated to your servers goes directly, and only, to each individual. That's $4.50 per guest per night to your dining room server, $3.50 to your assistant server, and $1.00 to your head server. They do not share with the kitchen staff.
Each service team (server/assistant server) typically handles a 4 top, a 6 top, and an 8 top at each dinner seating. This can vary a little, depending on whether larger groups want table together.
A head server is in charge of 1/3 of the dining room. I don't know the specific number of guests that will be under that umbrella.