I don't think Homer Kelley would agree that it is important to have massive forearms . . . even if you are a Hitter. He said he was a Hitting Devote . . . Look at him! He sort of looked like Mr. Magoo and Mr. Rogers had a baby . . . not a very intimdating physical presence exactly.
Stong Alignments and a Strong Computer he had . . . doubt he was much of an arm wrassler though.
Eddie Merrins book "Swing the Handle" was all about using both forearms to swing the club. It was definitely a four barrel swinging pattern....remember 6-B-2, the muscles of both forearms are available to actuate that assembly."
Please remember that all joint action is possible because the muscles above and below the joint of 'concern' cross the joint in question and enable the function of both extension and flexion. It is a very precarious process to dissern the exact origin of the problem or advantage. Certainly some people are born with the advantage of certain muscular developments. (i.e. many runners I have known that are renowned in their distance and still have skinny calves yet a guy in the streets has 'great' chisled calves. ) The forearms are a secondary muscle, though, important in the fulfillment of the golf swing. Development is often not as much a reflection of function but more a reflection of genetics. Size is not, and I repeat NOT, a reflection of power or function. There's more I could say . . . but it's more fun if someone else has more input. Vik
Ok, forearms are a necessary part of the whole formula. But always remember that they are secondary to the, dare I say, core muscles of the body. The only reason the tricep is the primary driver in the hitter's protocol is that the large chest muscle and the lat muscle have both performed their function in relation to the effort you intend to perform in the golf swing. The agreements of the performance of muscles would be different if your intent were different . . . but it's always consistent with the necessary effort.
That is why 'training for golf' outside limited guidelines is a waste of effort. I have seen many golf programs. They rarely look at the natural and neutral neurological associations of a natural spine . . . the basis upon which all of the unique golf positions are applied. If you get this . . . then you can understand that exercise is easy in its choices but more difficult in its application, and then you can make progress.