Based on the passage, it can be concluded that the author and Broyles-González hold essentially the same attitude toward

I wrote my diagram the same as the one in the video, but I also diagrammed these parts of the sentences "but just as often rely only on their broker or on hunches. Only a few always do their own research before investing." I considered "often" to mean "most" and so I diagrammed ISM -most- B or H. And then I considered "Only" to be a necessary indicator and so I diagrammed ISM --> R, which made me lost with a condensed diagram. Can you please explain to me why these additional notations I made are wrong? and how can I be sure what sentences to diagram? Thank you!