You seem to have a good grip on the matter. You are far too generous to the Department, of Labor in its abject failure to provide meaningful post-death QDRO regulations, as it was directed to do. The DoL gets a C- in QDRO class generally. As described, the crux seems to be the intent of the original decree. If that decree is “corrected” to reflect original intent and some sort of clerical mistake in naming the plan, I think the QDRO fiduciary could be more demanding of the state court action in persuading the plan that, in fact, it is a correction of a mistake at the time, and not an opportunistic grab at benefits that were not on the table in the first place. Normally, the fiduciary does not question the domestic relations proceeding, but this is not normal. Under normal circumstances, the domestic relations proceeding is adversarial. If revisiting the original divorce decree is adversarial, perhaps because the subsequent spouse is a party to the action to argue against naming a new plan, the plan fiduciary can be more accepting of the outcome.