Hank was teaching Mark O'Meara long before Tiger.
Foley was teaching Rose, Mahan, and others before Tiger. People knew who he was.
McCormick knows a ton about Spieth. With a new instructor he'd have to almost start over. That can have some pros, but it's full of cons, too.
You’re not a downer as this isn’t really intended to be a negative stat. Anti-handicap is just a way to gauge consistency really. And a little entertainment. For some it may provide a little reality as well. 😀