I get your sticking point, I concede there may have been one option, but I am not confident that is where he was and it was by looking at his track a rather straight track......., yeah......I was trying to give too much benefit of doubt, and to be perfectly blunt, that tiny tub to the NW did not exist in the SE where he came from in front of me. Remember I had a good look at it in disbelief from under it all and when I climbed through it, and broke out around 5000'.
So I am 99.9% sure it was a IMC sneaky.
Enough ranting, I believe there is a bunch that do this around YSBK as well. So it is not as rare as we hope.