I think JC Jones has it right in his implication that too many assume that Macdonald had something significant to do with the courses that really only Raynor had to do with.
I've never tried to calculate it but in my mind Macdonald was probably only actively involved in a signficant way ain less than ten golf course projects, if that.
In his own book the only ones he really talks about are:
NGLA
Piping Rock
The Lido
The Links Club
St Louis
Greenbrier
Mid Ocean
Yale
He hardly mentions projects like The Creek Club which he clearly had a great deal to do with in a number of ways not to even mention he was made the president of the corporation that owned the place. He hardly mentioned it in his book though and there appears to have been a good reason for it!
I think it is also quite interesting that in his book he really doesn't have a lot to say about the architecture of his own original iteration of Chicago GC.