I've been told the 14th at Yeamans is a Knoll hole, but I haven't played it...so I can't give my first hand opinion. However, I've seen pictures and it looks like one.
In regards to a Redan, I've seen photos of the 15th at North Berwick, 4 at The National, and 3 at Piping Rock and on all of those you really can't see the green as it is hidden by the elevated nature of the green. And it is my understanding that this is a defining characteristic of a Redan. So if you decide to try to go for the green in one shot, you've got to get the ball up over that edge/hill and then hold the ball on the green as the green slopes away from you.
On that picture related to the 14th at Kiawah Ocean, I guess I could see a Redan if that pin would be moved to behind that bunker...but regardless you can still see the right side of the green and you can hit right to that part of the green with no real issue. Hence, my confusion as to why people call that a Redan and, hence, the question and seeking thoughts, opinions, and clarifications.
And then, if 14 at Kiawah is a Redan...I guess I am struggling to see what seperates a Redan from a Knoll other than a par 3 vs par 4?