...and i dont know why they would lie under oath to a grand jury especially after they turned their phones in and have been cooperating...then its a legally tenuous claim that the defense can exploit to show a biased/overzealous police department.

i think chicago pd jumped that gun at least on this one specific point.

even if it was some indirect payout scheme...if you dont have an admission or corroborating evidence from a witness...you cant just assume. especially when the corroborating witness *contradicts* it.