Everyone's a Monday Morning Quarterback (or I guess in this case I should say a Monday Morning Screenwriter). As is the case with most of these types of frequent critiques, be it how they handled replacing Barbara Bel Geddes, Bobby's death and return, the exit of Pam, even Conundrum, it's relatively easy to look back with years (nay, decades) of hindsight and say "they should have just done ____ instead and that would have been better." I'm sure the death was somewhat unexpected, they needed to keep the show going with as minimal rewrites to existing scripts as possible, until they were able to figure out the best way to address Jim Davis' death on the show. Keeping Jock alive but off-screen for awhile was probably the best way to do that at the time. And, in my opinion, when they did address it, I think they handled it perfectly, both with the disappearance and the sons going to search for him, until they confirmed his death and then lead to the reading of his Will and the contest for control of Ewing Oil.