So what Airborne Aircrew has successfully proved is that the underlying premise of the whole story is wrong: there was no Canadian Harold A Raasch
So what options do we have?
1) the visitor was one of the two H A Raasches we've found but he lied about his reasons, history and over flying the aircraft
2) El Grifo misunderstood what he was told, or memory has dimmed with time
3) the visitor was an unknown person who assumed the identity of H A Raasch
None are palatable answers, but I can't see any other realistic options