The issue is, we don't know any of the things you've said. (A) We don't know that there was a robbery. [We know that someone said that someone may have attempted to break in to a house; we don't know that it was successful or that anything was stolen or even if the person really was unauthorized. I was once stopped by some guy's neighbors because they knew he was out of town and saw me entering and exiting his house; I had entered with a house key and was filling in for a friend in feeding the guy's cat. Had they called the cops to report it instead of confronting me directly, that sort of description might have circulated.] (B) We know that the police officer followed him for a few minutes before stopping him (he walked a block and a half to a crosswalk after stopping his car, and then he crossed the street), but also that he was walking in the direction of downtown Boston, which is where the officer said that the event took place. Given these I would conservatively estimate at least a 15-minute gap, but it could easily have been several hours. (C) The closest house in that direction is indeed about 200m away from the burrito place he was stopped at, but we have no reason to think that the event happened there and not, say in the mass of houses that are 2km away in the same direction, or possibly past downtown in the many houses in Cambridge. In fact the response that he elicited ("I came from Dedham", more than 10km away in the opposite direction) suggests that the officer was not pointing towards some specific house but rather gesturing wildly in the direction of downtown Boston and Cambridge.