I don't know if the NJ/NY war was necessarily a shark jump,in the sense that the quality of the show didn't go south after that.I think the quality of the show stayed high to the end. I will grant you that it probably would not have happened that way in the real Mob world.

The show did take some liberties for the sake of entertainment,but I would put the whole "Kevin Finnerty"
storyline as the lowest point of Chase's creative output.
IMHO,I didn't get it,didn't like it,and was really pi**ed off when it finally went nowhere.The Russian ,Chris's murder of JT,and some of the other dead ends were OK,because that's how life goes sometimes.Not everything is resolved.

The dream sequences,for me, were the worst parts of the show and I hated seeing them come on the screen.