Years ago, when with K and N and doing a MP for Old Elm, they told us the story that they wanted a collaborative design, secretly asked both Ross and Colt to the club, and locked them together in an upstairs room to hammer out a design, more or less against their will. It is said that the design of Shoreacres was offered to both (as it would be a second club for many members) and both turned it down from the original experience, thus Raynor got the job.
Perhaps it was just club lore, but that is the story they told - a forced collaboration.....
Not exactly on topic, but here are my collaborations over the years (excluding Tour Pros):
Windstone, Chattanooga, TN (with Gary Baird, who actually did the front nine five years eariler, while we did the back later, so we share credit)
Whitestone, Benbrook, TX - with Jay Morrish, a true collaboration, but my firm did all the drawing, he consulted on design and field visits
La Costa Champions Course, Carlsbad, CA - with Pascuzzo and Pate (renovation) and also a true collaboration
I have some former associates who claim collaborative design credit on some projects, but its not quite the same!