I cannot imagine him having information that could possibly be useful and if he does, I cannot imagine him being able to document the information so that it would actually be useful (no sane prosecutor is going to base their case on his word).
My suspicion is Michelle Obama got involved.
Exactly, he has the intelligence and malleability of a brain dead person making him the perfect political puppet to take huge personal risks to sell this narrative. Lets not forget that Kamala Harris introduced her "anti-lynching" bill the week that this happened. There are also people suggesting that Harris and Smollett are related, among other shady activities and personalities involved. I would speculate that they probably have some form of documentation to back up the complicity of these other higher level individuals along with any states evidence testimony he has/will give. Besides the local charges, just based on the charges of terrorist threats alone he could go away for a VERY long time. That kind of time has a way of making people very cooperative.
The Chicago Police released the investigative report on their investigation, which gives more insight on how much evidence there is against Smollett.
When Smollett was initially charged, the police laid out the case against Smollett in a press conference, which was unusual, IMO. I am thinking the police may have thought that Kim Foxx might have tried to do something like this when they did this.