Re:i will get ripped for this. but please help.
You don't need all those different exercise variations in order to work all the different parts of your chest, because there is only one part of your chest. It is one muscle. You cannot isolate the lower part of the chest or the upper part or the outer or the inner. It just doesn't work that way. Your chest will grow as one and take on a genetically predetermined shape as it does so.
Also, the point of doing a low volume routine based around compound movements is that compound movements hit a large number of muscles.
On 'push' day, you are aiming to work your chest, shoulders and triceps. Considering the movements:
Bench Press = works your chest, shoulders and triceps (as well as your upper back and lats to a degree, depending on your technique)
Overhead Press = works your shoulders, triceps and your chest to a degree
Dips = works your chest, shoulders and triceps.
So if your push day just consisted of those 3 exercises, then you are in fact doing 3 exercises for your chest, 3 exercises for your shoulders and 3 exercises for your triceps, because all these muscle groups get worked by the same movements. Just because you are not isolating a muscle does not mean you aren't hitting it.