The theory forum thread got quite sidetracked. Here's some more rambling free of charge:
The point is that I consider the marginal hands first and then I fill in the blanks. The most important hands are the marginal hands. If instead I was to think about the hands in the middle of my opponents value and bluffing ranges I would still have to fill in the blanks. However by concentrating on the marginal hands I can fast forward the process in my mind visually.
This isn't something that I came up with before I tried to implement it at the table. This is just the thinking process that I have adapted to after many hands.
I decided to actively think about the process after a river situation caught my eye. I had called a river bet in a checked down pot with queen high in a heads up limit holdem game. It turned out that my opponent was bluffing with the exact same hand. We chopped it and it got me thinking about the top of his bluffing range. Different people view the games differently. I for one wouldn't have bluffed in my opponents shoes because queen high is often good enough to win a showdown in heads up limit holdem in a checked down pot and if he's bluffing all worse hands in his range then he's likely quite bluff heavy. Now that I've identified the hand that surely must be close to the top of his bluffing range, it's easier for me to calculate the best response at game speed vs that opponent.
Then after the session I was mentally reviewing the hand and put my finger on something that had previously escaped me conceptually.
I think the idea is particularly valuable on the river, but I chose to put my thought process for flop decisions in the op because there are so many ways to get to the river action but there are relatively few flop situations.