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A Wi-Fi device's first priority is to decide if an incoming frame is in tact or not. It has to do that by reading the entire frame, calculate the CRC, and then check then compare that to the incoming frame's CRC. At that time, the device then has to read the entire MAC header. This is for one of two reasons. First, to see if the frame is destined for it (receiver address) and then to process any duration value.

If I am understanding the situation properly, the answer to the question is that every frame is read and processed (see above) by every device that can hear that transmission (Same channel, compatible modulation, etc).

The only thing I will add to that is that the unicast frame is dropped by the receiving radio if the RA address in the MAC header is not the same as the MAC address of the receiver radio. The receiver radio will absolutely read the MAC header and the duration value but will not use the Distribution System Services (DSS) to forward the body of the frame.