Mark/John,
To follow up, I took a look at Geoff's Riviera history, specifically, the section on Mackenzie's visit to Riviera and his account of the "Mashie Course".
Geoff highlights the very favorable comments Mackenzie made about Thomas' work, providing no hint of any ill feelings on Mackenzie's part.
Goeff also states that the Mashie course (which no longer exists) was also Thomas' design.
After looking at the club history, I also took a look at Geoff's more serious study of Goerge Thomas "The Captain" wherein he comments more extensively, and perhaps more candidly, about Mackenzie and Riviera. Geoff reports Mackenzie being very crtical of Thomas' Mashie course, so critical that Riviera oldtimers speculate he was unhappy he didn't receive the commision to build the main course.