jimmy was not a rat as lompac was saying it was pussy the dirty cop got the two mixed up. He was telling tony what the feds were telling him. The way they did the scene made it seem like jimmy was trying to get tony to say something incriminating but in reality he was telling tony he has a snitch in his crew and telling him what the feds were building on tony. That is all tony needed to wack jimmy. The columbian rip off didnt involve jimmy pussy and paulie were in on that. There is no way jimmy was a rat they (tony&jr)knew they had one but jumped the gun.