So what info did Micah give to Milton?

I hear it's a debated topic that Micah might not have been a snitch, and after looking into it, i think it's a reasonable thing to believe, cause the big thing is, as far as i can tell, the pinkertons during chapter 6 were constantly caught off guard by the gangs activities, and were never aware of what they were doing until afterwards, which i think wouldn't be the case if Micah was snitching.

So did he actually give them any information that actually helped the pinkertons?