QUOTE (Mr. Herbert @ Sep 21 2009, 12:51 PM)

Since it's a scramble, you all have to play your shots from the same point. Since two people have already putted, I think you're committed to that spot on the green, and the ball should be replaced.
Now if it was the first person getting ready to putt, and the ball moved, I think then that maybe all of you could putt from the new position, since no one had putted yet before the ball moved.
This is my "scramble rules" interpretation:
The third person should putt from new location as should the fourth. If neither of those two make the putt then the first and second should get a retry from the new position since normally everyone should play from the same spot. This is only valid if the ball moved CLOSER to the hole. If the ball moved farther from the hole, then that should be disregarded completely.