Another Divorce for Tiger Woods, a Chapter in Stevie's Book?

In what appeared to be more like a tabloid divorce than a dismissal in a working relationship, Tiger Woods fired long-time caddie and friend Steve Williams... the question is, why?
Shock and disappointment appeared to come from Williams at the "matter-of-fact" way in which the Woods handled the split but both knew the end was near.
Shock and a nine-iron came from Elin's ire when she got the news but she rebounded and so will Steve.

"It's time for a change," bemoaned Tiger Woods, with Steve rebutting, "after thirteen years of loyal service...through Tiger’s scandal, a new coach...a major swing change and Tiger battling through injuries...I am very disappointed to end our very successful partnership at this time."Why is Woods getting rid of everyone who has ever stood beside him?

A temporary(?) switch with Woods' blessing to carry the bag for fellow Aussie Adam Scott at the U.S. Open was an indication of trouble in paradise for the long-term pair. Tiger Woods was injured and Stevie needed the work so it appeared to be in "good faith" but, behind the scenes, Williams had lost respect for the former number-one world golfer after word of Tiger's adulterous nature came to light. 
When Steve didn't let Tiger in on his decision to carry the bag for Adam Scott at the AT&T he was called "disloyal" by Woods...ouch! Caddie mistrust...
As celebrity break-ups go, a book is probably now in the works. Steve Williams has let slip that Tiger Woods would be mentioned, "You know, when I write my book, it'll be the time I decide what I write," Williams said. "It'll just be one of those interesting chapters in the book."

As an aside, I was asked yesterday on Twitter to what percent do I think Steve Williams helped Tiger Woods throughout his reign? I said 25 percent. What is your opinion?