Joe Hancock,
That too would be a good indicator.
Or, if they were refered by TEPaul.
Jeff Brauer made an interesting point about "intended clientele"
and, I think your point about referal, when combined with Jeff's comment, seems logical.
Paul Payne,
I think Dr Mac transitioned from a highly educated man, enamored of the art of camoflage into an architect under the tutorage of H.S. Colt and then Alison. In other words, he was mentored prior to creating some of his great designs. Whether that happened osmotically, or by design, I don't know, but, he evolved over time, not as an overnight sensation.
Mike Vegis,
Like Dr Mac, Pete Dye made a career change.
Pete Dye was an architect for a number of years before he "arrived" with name designs.
He and Alice formed their design team in 1959.
If you review their body of work, you wouldn't say that they were discovered in overnight. They evolved as a team over time. And certainly, they didn't get big projects right off the bat.