My opinion from an oline perspective: Facing blitzes without lowers on, let alone no pads at all, is BS and really all that is gained out of it is positioning. A one-on-one battle against a guy with a 3 yard running start who you can't go low on gives you little opportunity at success. Also, without shoulder pads on it gives you nothing to grab onto with inside hand position. Futher putting them at a disadvantage even in non blitzing situations.