Even if the pa31 couldn't for some reason maintain height and Richmond was fogged in why would u try an approach there if u know you can’t get it and risk doing a 1 engine missed approach from there at a aerodrome you are unfamiliar with when he knew Ybsk was relativity clear.
You should read the thread mate, before posting stuff like this, but briefly, whatever fog was present at Richmond was classified as fog patches, which by definition are no more than 6 feet thick... the point being that he would never have entered whatever was there, and the reported vis was such that the runway would be clearly visible... and it is a very big runway. People in the area at the time have said on this thread that the "fog" amounted to hardly anything. Anyway, read the thread...