There’s no denying that LBJ tried to micromanage the war from the Oval Office, a terrible thing to do. I still think it was McNamera that skewed his vision of how the war should be waged.
So what you kind of had was Johnson making the formal decisions after McNamera had counseled him improperly.
That’s my take on it. I may be wrong. People who disagree should set me straight.
IMHO, they were pretty much in sync. McNamara from a tactical/strategic standpoint told the the boss exactly what the boss wanted the hear. LBJ was a micro-manager on thing other than the war as well. Their policies, especially to on again-off again bombing campaigns and avoiding any target if they knew there were Russian 'advisers' there were beyond insane.
They were a bad team.