The routine was originaly: Workout A 3x5 Squat 3x5 Bench Press 1x5 Deadlift Workout B 3x5 Squat 3x5 Standing military press 3x5 Bent Rows Dips and chinups were added later so they aren't critical at all. But, doing dips and benchpress on Monday would mean using your chest twice in two different ways. Same doing pull/chinups and bent-over row on Wednesday would be using your back in two different ways.
That makes sense. So could I do dips and chins on A? Because I'd like to do chins AND pulls and one point or another.
To say isolation exercises are completely pointless is misinformed. An unbelievable number of boxers have 'lagging' body parts and it is crucial to get muscles working in proportion to one another. Isolating muscles will help do exactly that.
Depends on what you mean by "lagging". When I hear people say that they mean size. If you mean muscle group imbalances then some isolation may be needed, but for the most part isolation is entirely pointless.