That looks fairly accurate at most places. Floors are sometimes called "table games supervisors".
Also, 4, 5, 6, or 7 could be in charge at any time. I've even seen a "pit boss" be in charge of all table games at a small place.
Once, I had 5,6 and 7 all show up at my table at once. The best part was I didn't even get backed off: they just wanted to talk to a whale at my table!