Proportioning valve question for disc brake conversion

The picture that french demon posted is what mine is like everyone just confused me again but is the proportioning valve going on mine or can i leave it out yall confused me again lol.
If you are going to disc brakes, you MUST use a proportioning valve, whether it's like the factory one @Oldmanmopar showed you, OR the aftermarket one you add in the rear line. PERIOD. what's confusing about that?