On a side note, I noticed that J.B. Holmes is going off Thursday in the first group at 10:15 and
DeChambeau is going off in the 6th group at 11:10. I bet that doesn't excite some of the other players.
The PGA has made some rather bold moves wrt to rules in the last year plus. They may very well move quickly on this issue.
As for slow players Ben Crane comes to mind quickly (remember when Sabbatini had had it with Crane and finished out the 17th at Congressional while Crane was still in the fairway). Kevin Na is a fairly slow player. Spieth and Day aren't exactly quick out there.