Steven's partner Hank is also very busy right now. The collaboration with the FBI was initiated by him, so he's naturally fully involved in the current investigation, which means he's definitely not part of this dinner.
In Albuquerque, Steven certainly chose Mexican food, so at a small street shop, Jimmy and Steven drank beer, ate green chili chicken burritos and extra spicy fried chicken tacos, and talked about the previous operation.
Steven: "Jimmy, that guy, was it you?"
Jimmy asked confusedly: "What?"
Steven: "That scumbag john."
Jimmy: "Hey, hey, don't talk nonsense. It has nothing to do with me. It was an accident during the shootout. He was taken down by that security guard, and I only took down that security guard."
Steven: "OK, nice job."
Jimmy: "How's the investigation going on your end? That Carlos guy."
