Obviously there still seems to be confusion here about the meaning of stall sharing, 2 cars cannot use the same leads on 1 supercharger stall at the same time!
Stall Sharing
e.g - At a 6 stall supercharger, the stalls are paired (shared power) and are labelled 1A, 1B, 2A, 2B, 3A & 3B.
If there are only 2 cars charging, using stalls 1A & 3A, in theory, the cars will receive their maximum charging rate, depending on SoC, battery size, temp etc.
If the 2 cars charging are using stalls 1A & 1B, they're using a paired stall and the max charging rate is reduced because the power output is
shared between the 2 cars.
Here's a YouTube video that explains it pretty well
BTW, none of the above applies to V3 (250kW) superchargers, but there are currently none of those in Australia.