Hi Steve. Was your question rhetorical?
I believe Oswald gave Whaley the destination five blocks south of the rooming house because he wanted the cab to pass by the house so that he could determine if the authorities would be there looking for him. After seeing the coast was clear, and still two blocks short of the original destination, Oswald tells Whaley that 'this will do just fine" and exits the cab three blocks past the rooming house (instead of five; shorter walk back to the house).
Well, a bit rhetorical and a bit serious with the serious purpose directed at the Oswald defenders.
It seems obvious - doesn't it? - that he was worried about someone waiting for him at the house. Otherwise why go through those measures? What's an alternate explanation?
And what is the explanation anyway for him taking a cab to get to his rooming house? What's the rush to get there? There's a long series of acts by Oswald after the assassination that indicate to me that he was in flight from the TSBD. Any other explanation that considers all of those acts simply don't make sense. To me.
As Robert Blakey said, any explanation as to what happened in Dallas begins with the Oswald. The question is does it end with him or is there more? E.g., did he have help? was he manipulated?