Forearms and hands can for sure be a deterrent.. if too stiff and not relaxed. Forearms and hands help with direction and stage a good barrel turn. I believe very little if any power is provided by the hands and forearms. I believe if you force the hands and forearms to TTB, there will be a good chance of disconnectionSo the question is can you get a good "TTB" barrel path without thinking about doing anything in particular with the hands/forearms assuming everything else (e.g. core usage) is correct.