Beaver, I think you may be the one "missing some facts" mate.
Welborn was in the 1st XV for two years, the second as Vice Captain, and was a very good player, if a little "soft" in the tough stuff. He certainly made up for that in later years.
Not only did I have a brother playing alongside him in those years, I mentioned earlier that I actually watched him play in those years.
I seem to recall him making at least one Open Schoolboys State team in that period too though I may be wrong there.
While he was not the best player of his year group he certainly had ability and deserved his spot as a senior player.
I have no way of knowing if your enrolement story has any credability however, if you believe half of what you hear around the Scotch courtyards you will be a long way in front.
As for ragging on an Old Boy, well you lose major cred with me for that sorry mate, that's just not on.