Rugby wrote: Luke is one of the poorest drivers on tour-short and wild !!!
Disclaimer: I don't play the game and what I don't know about golf would fill many volumes.
But recently I followed Luke on a relatively average round of the Houston Open and saw every stroke. That day, playing with relatively average Tour drivers, he was usually not 1st to hit the 2nd shot -- meaning of course that he wasn't shortest off the tee. To my eye his bigger problem was fairway woods and long irons, too often sprayed into bunkers. Putts didn't always fall yet his overall score was respectable. Based on what I saw personally (one day) I wouldn't necessarily have concluded he was a poor driver.
A look at the most current PGA stats, however, considerably align with Rugby's statement. Donald is in the bottom 10% in average driving distance, and only near the top of bottom quartile in accuracy. Rassler is right about 280-yd distance but that must be compared with others on tour and the numbers show that to be quite below average among the big boys.
I'd never really looked at driving rankings. There are interesting surprises. Jim Furyk, for instance, is currently last in distance but among the tops in driving accuracy. On balance I'd think the latter is more important and probably what concerns Luke the most. Perhaps indeed his change of swing coach, in reported search of increased distance, has truly harmed overall efficiency.
Stats indicate Donald is still among the very top putters on Tour.
All of the above is probably well known to golf aficionados but of interest to a casual follower, and (unfortunately) support Rugby's assessment. Let's hope for improvement.