The standard way to locate dumbness is to look for a stop, or a flap.
The first thing to do is unstop the stop or settle the flap.
There are gradients of stops and of flaps. They stem from the guy who was not quite with it and somehow got others caught up in his confusion, unnoticed by them or others.
The way to find this person is to find by observation or questioning, what are the data being operated on by whoever is doing the stopping or the flapping.
You then ask him who he got the data from, or who was it that raised the question in the first place.
He may have difficulty in recalling it — he went into agreement with it without inspecting it — but if you persist he will tell you. Follow it down to the person who can’t tell you where it all came from, and there’s your source of dumbness.
Do it enough times and you’ll come up with the same name or names. There’s the org’s Dev-T artist!
You could handle it by finding the guy’s confusions, misunderstoods, misduplications, identifications, etc., using Standard Tech. At his own expense.