Walter Kennedy
I have no problem with most of what you say about the weather. I have stood on the Mull of Kintyre many times in the localised mist you describe. I've also walked a few yards and suddenly been able to see Northern Ireland. What I cannot describe is the view the pilots had from the cockpit on that day. As that is the important factor then I make a hopeless witness.
I still don't think you understand the "airworthiness" argument. Nobody has claimed it caused the accident. From what I've read, there was a history of accidents being directly caused by this so the possibility of it being the cause has a plausible basis. Your theory is less plausible.