The narrative says that at first he did not stop Brown because he thought they were suspects. IT was only after he started to leave that he heard something on the radio about a robbery, and saw something in their hands that looked like the cigar boxes. From that point on it was a dynamic interaction.
What I noticed on the video of the robbery, was the behavior of Brown, ie how quick he was to confront the smaller sized shop owner. It was like it was a reflex.
Move ahead 15 minutes, and he confronts a cop. Sounds like he didn’t hesitate to show his aggression, ie if this accounting is accurate.
Speculating that there are probably some rapes in Big Mike’s past, as well, considering his
“I’ll take what I want because I’m bigger than you” attitude.
I will admit to not following the details of the incident very closely, but you make an important distinction as to precise timing of Wilson's awareness of the strongarm robbery.
The account presented here is the most detailed one I've seen. My vague impression has been that the police made a point of saying Wilson didn't know about the robbery (period). I'm not sure that's what they actually said, or if it was qualified as "robbery wasn't the reason to tell them to get out of the middle of the street - although that's sort of a "duh, no kidding" point. If the initial request to brown was to get out of the middle of the street, it seems rather obvious that Wilson didn't suspect Brown of anything other than walking in the middle of the street.