I suppose Skee Reigel has some kind of horse in the race, too. From James Dodson's Ben Hogan: An American Life, page 313 (recalling the 1951 Masters, where he finished second to Hogan):
"'I remember playing a practice round or two with him about then,' says Skee Reigel, 'and thinking, if he was great before the accident, he was even better now. Ben's control of the ball was now basically unearthly.'"
Snead must also have a horse. From page 328 (recalling the 1952 Masters):
"Ben's ball-striking had never been better at that time, but a lot of folks didn't realize that his putter really started acting up in '52 and '53."
As well as Herbert Warren Wind, page 341 (watching Hogan practice at Tamarisk in early 1953):
"The golf shots I watched him hit that morning were as fine as I'd ever seen him make. I recall thinking-I even remarked as much to him during our lunch-that this had to be unwelcome news to the rest of the Tour. He just smiled at that. Here he was out in the desert, with no one watching, getting himself into the finest playing condition of his career."
Looks like Hogan himself must have a horse in this race: from page 346 (describing play in the third round of the 1953 Masters):
"On 13, Ben hammered his finest drive of the tournament-the best drive of his life, he told the Associated Press afterward-a curving rope that flew 270 yards and drew magnificently around the dogleg of the famous par-5 hole."
From page 348 (at the conclusion of the 1953 Masters):
"In the crowded locker room, Hogan sipped a cold beer and admitted he'd never struck the ball better over seventy-two holes of competition."
Obviously, these sentiments are at odds with Hogan saying he was a better "golfer" pre-wreck. However, Hogan isn't the only golfing great to make such an apparent contradiction: the consensus is that Nicklaus was a better ball-striker in the early-to-mid '60's, but Nickluas SAYS that he played his best golf from '71 to '75. Either way, Hogan is clearly on record that he discovered the "secret" in 1946, so he obviously had it well-ingrained by '48/'49, perhaps more so then is seen in the Power Golf sequences, which were probably shot in 1947 (the book was published in April 1948).