Path of fluid --- one is the pressure from the torque convertor return fluid flow going to be cooled

the other is the of corse the return and it just dumps into the trans pan < the filter in the pan is the catcher of all this sort of debris

if it is a keep you up at night thing and it should not be - its not a human body and we all know they leave screwdrivers in them

i would replace the lines first - run the car 1/2 hour and than change the oil in pan with a new filter and do the convertor -- its the way i would do it -- jz