I am not disagreeing with you that the TCS or YAW applies the brakes during wheel spin or sliding. The differential is irrelevant to the the TCS. You stated that the wheels turn counter to each other. That is Limited Slip Differential. Open differential only 1 wheel would turn. Locked both would turn in the same direction at the same rpm. The TCS controls wheel spin not the relationship from wide side to the other. Wheel spin relevant to the TCS is relevant to any tire spinning.

with a LSD 1 wheel will spin then switch to the other side. In this case with TCS the car sense the left rear tire spinning and applies the brake. In the meantime the drive has already been switched to the other wheel. Think of it as having both limited slip and TCS.


Leadfoot