Spoiler Alert: The lead-up to the final scenes

Hello.

In the jail, the guy, who is a higher up in Tany's crew, says he knows what they can do to avoid taking the fall, which is inevitable because the Corsican Cops (the dirty cops) will not protect them, and the guy who was nabbed cannot be hit because there is too much protection. So they know they'll rot. They put in play the only thing that can save them. That was, order a hit on Dujardin. He normally cannot make this call, but since everyone in the crew is locked up besides Tany and his #2, they agree to do this because it means they can (falsely) testify against Tany and say he ordered the hit against Michel, and give them any other info the cops want, giving them freedom and witness protection in Canada. And there will be no one to be protected from since the crew will be disbanded and Tany in prison for the murder of Michel, again, because he will have been betrayed by his crew in prison who will say he was responsible. Tany knows this is what's happened the exact moment when his #2 tells him Michel has been killed. The important thing here is, the middle man (the guy with his girlfriend) will also be let off the hook so neither the dirty cops nor the criminals will have to worry about him snitching. This protects the dirty cops' identity. So yes, there were actually two dirty cops present at the end who had a hand in the assassination of Michel. Both on the left and right. No justice.