The nature of 802.11 signalling is CSMA/CA (CA=Collision Avoidance).
The root AP/Bridge should be orchastrating the traffic such that only one client is talking to it at any given time.
That said, it would be a benefit to have them "talking" as fast as possible to make the next available "talk slot" is presented in the shortest possible time.
Each client (generally speaking) is held to a specific length of "talk time," so it is not likely that one client could monopolize the link.
Although APs / bridges are frequently described as "Hub-Like" (or Switch-like), the communication is actually coordinated by the AP or Root bridge, not a "free - for - all" as it would be in a wired hub environment.
Good Luck
Scott