Depends on when the sequence was shot. When he played the senior tour, he very much followed the theories of Hank Haney. I saw him play in the early 90's and he worked a lot on flattening his plane. In his prime, he swung more steeply and could get quite short on the backswing. This may have cost him some majors, he finished second to Nicklaus more than a few times in the 70's. He was a great putter.