Yes, he just left Marina some money. And he just left the building. And he just took a bus. And he just took a cab. And he just went to a movie.
This is how he characterizes Oswald's actions. He strips it of any context and describes the actions in the most innocent of ways.
You're assuming that every random action must be meaningful, because...you know...he murdered the president.
If I was defending Oswald before a court, I'd try that too. But we're not in a courtroom and we're not supposed to be trying to get him off. We're trying to find out - as best as we can - what he was doing and what happened that day.
I agree, so why attribute malice to every single action? This is something that the LNs seem to understand for example when talking about the DPD's many incompetencies with evidence handling.
This latter approach is bad for Oswald and it's why he rejects it.
The guy argued with his wife the night before and she refused to move back to Dallas with him. Why do you have to make any more of it than that? Just to try to bolster a weak case?