At this stage, the fluid returns with the turbine, moving into the pump now going in the exact same route as the pump, And so the stator just isn't required. Slippage consumes energy during the coupling section. Locking the converter shell on the turbine shaft prevents this slippage from occurring. https://rafaelnomjf.idblogmaker.com/33373991/the-definitive-guide-to-torque-converter-clutch