Not sure if this was mentioned before...If you accept the bank job from Rattus he pretty much disappears from the world. This was thought to be a possible bug or maybe something they didn't develop in the game as much as planned. Well, I talked to barlone about Rattus at one point and he said, "I heard he took a bullet over Arnika way."
I thought it was interesting and funny.
Never tried asking Barlone about Rattus. This was AFTER accepting the "Bank job" quest from him? That response leads me to believe that if this quest was intact, Rattus would be gone anyway. Question is, how does his demise come about?
Maybe he wasn't "authorized" by the Razuka to perform this "heist". Would explain why he doesn't do it himself or ask to "tag" along to protect his "investment".
Guess we'll never know.
Spence