If you chaps will excuse a non-pro question, is there any sense in which the use of reversers alters the (aero-)dynamics of the situation such that the brake application is more effective *in itself* than when used on its own? I.E. is there a sense in which the reversers do not just contribute to retardation but also assist the working of the brakes in themselves, such that when removing reversers from the equation the brakes, particularly with a less than perfect runway surface, contribute less even than the contribution they were making previously to the joint braking effort?
Do the reversers, for instance, cause the aircraft to "sit down" more, assisting the wheels to "bite" under braking?