The Paul I'm researching is the Paul of The Beatles' movies, A Hard Day's Night and Help. Anyone who has done research on Paul knows that The Beatles--and Paul in particular--were apparently being threatened with replacement all the time they were in the group; you know, get in line or you're out.
There were several photographers who did photo shoots with Paul look-alikes but these men never actually made it into the group.
Again, if researchers will stay focused on "our" Paul--the Paul of the movies--the truth about The Beatles will be found. If you get sidetracked with the many facial doubles, it will be an Alice In Wonderland chase. Maybe that's what the English "powers that be" wanted.