Well, whenever people bring it up, they almost always rattle off a list of fast bowlers. We would expect them to have greater forces going through the arm, and therefore greater extension.
Also, I'm not conviced that bowling in an arm brace actually proves as much as what people might think, because the brace will provide support to the elbow that would otherwise have to be provided from the muscles, and so the arm can be more relaxed the whole way round as one does not need to guard against over-extending the elbow: this will not only allow more wrist movement than with a tense arm, but will also eliminate the tendency for the forearm to snap forward as the grip on the ball relaxes in order to release it, as the forearm needn't be tensed to protect the elbow. With different wrist motions, more flex
may occur in the elbow to avoid straining it.
I remember reading on Cricinfo that Geoff Griffen once bowled in an arm brace in a domestic match: IIRC, he explained his problems as being due to his wrist action (an argument also used about Meckiff). Apparently, he managed to bowl his deliveries effectively, to the surprise of one witness.
However, there is a problem:
Griffin definitely threw:
View attachment 24263View attachment 24264
Incidentally, what happened to the chucker's tilt?