John,
Its a fair question, but really, I don't know if there is any correlation.
In personality terms, there are great golf champions from the serious (Crenshaw) to the funny (Zoellar and Trevino) and the family men to the womanizers, teetotalers to the drunks, you name it. Many successful people treat service people terribly, others treat them great.
I don't see why the gca universe can't have the same range. I don't think that design ability is genetically or mentally tied strongly to any one personality type. And, if you did a matrix of personal qualities of all gca's through history, you would probably see that they are all over the map, as are champion golfers, which would tend to prove that point.
Obviously, the sum total of someone's traits will determine if any individual client would want to work closely with someone. But not all. The problem with making quick judgements about someone on one or two things (which, BTW, does happen in the typical interview process) is that the great salesman types might get more jobs based on first impressions. The quiet, deep thinker won't make as good a first impression, but could be the better choice long run, perhaps because of that very quality.