Michael does get subpoenaed to testify at Eugene's trial. He then spills part of the beans: Adam was driving the car that killed Rocco. It broke Fia's heart and she ran to her family.
But the day after, Eugene testifies and spills the rest: his family was caused by a criminal act since they had their gas cut off weeks before the explosion. Now Fia is completely shattered and gives her son for adoption (he does find a new family). Eugene is now under federal protection.
Meawhile, Gina becomes head of the Baxter. She falsely accuses Jimmy of wanting to go to the police, so her father shoots him (he barely survives) and goes to jail. Big Mo sells her club but "inherit" the streets in the Quarter for drug sell.
And Michael goes back to jail. I hope there won't be a third season; this is a satisfying ending.
Final rating: 4.2/5
Season rating: 3.6/5 (too slow to start)