It was on the 18th where Bradley watched an errant approach shot from the muddy rough crash into one of the stands at the back of the green. "As of right now, the golf course is unplayable".
While Rose was even through the early part of his Round 4, Billy Horschel (3-under through eight) and Keegan Bradley (4-under through eight) joined him atop the leaderboard at minus-17.
"That doesn't make any difference", White said.
That break in the weather never happened Sunday.
The plan is for groups of three to begin play at 7:30 am EST off two tees at a time.
"We had a golf course we couldn't play", said Slugger White, the tour's vice-president of competition.
They postponed the final round until Monday, but with more rain forecast overnight there is no guarantee they will be able to complete the penultimate FedExCup playoff event.More news: Djokovic dismisses del Potro to win US Open
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"Nor would we start a round on Monday thinking we could not get half the field finished", he said.
Half the field needs to finish its Monday rounds in order to take the rain-delayed tournament into a sixth day on Tuesday if necessary.
Cape Town - Jordan Spieth is facing the prospect of a fine or suspension from the the PGA Tour if circumstances mean he misses the season-ending Tour Championship.
Keegan Bradley is 30th and would be exempt for the first three major championships in 2019.
Emiliano Grillo, Andrew Putnam, Ryan Armour and Chez Reavie hold down the 31st through 35th positions.
Bryson DeChambeau, who won the first two FedEx events at the Northern Trust, is assured of leaving the BMW Championship atop the standings heading to Atlanta.
Justin Rose has become the first English world No 1 since Luke Donald in August 2012 after finishing second at BMW Championship in Philadelphia.