It was ridiculous how they still managed to call it a "Barnes-Ewing feud", when really, there wasn't a Barnes family to work with after a point! Just Cliff! And even when Pam was around, she didn't really participate in it that much. I wouldn't have minded seeing cousin Jimmy again.I really think the writers and producers missed a trick not doing more with Cousin Jimmy. The Barnes family seemed so much smaller and less significant than the Ewings. Jimmy could have been re-introduced to work with Cliff against the Ewings, or working against Cliff to try and grab some of that Barnes-Wentworth money once Cliff became a major force.
I don't remember if this is true or not, but I heard that the actor who played him also played the special needs teacher that Donna and Ray talked to in the dream season. Maybe that was what Jimmy did after he stopped hanging out with his family?