Some story lines will enliven this PGA Championship

The PGA Championship counts the same as the Masters, U.S. Open and British Open. It just doesn't seem that way. Because, well, it's generally viewed as being fourth in the grand-slam pecking order. Just don't try selling that to five-time champion Jack Nicklaus, who I'm sure treasures those Wanamaker Trophies every bit as much as his other 13 major titles. Still ...