1: To the Op’s question regarding Gilbert. It’s highly unlikely. You have to look at this rationally. Gilbert grew up in a small farming community in the middle of nowhere Pennsylvania. There was likely very little development in that area in the 70’s, let alone anyone to consult regarding advanced sports medicine or body physics in general, especially anything that would translate to guitar playing. Even if there were, this takes resources he likely didn’t have. He often sites not even being able to find heavy metal records back then, and it was his father, who built his first guitars for him. He even has mentioned selling his instruments when he was at GIT so he could buy a cheap car to travel back and forth during his first introduction to Mke Varney’s studio. This doesn’t strike me as a family with the resources for PT consultation, especially for back then.
In his Mr. Big days, when he had more resources available, it could have been a possibility, but we don’t see any real drastic change in his playing technique from that era. It’s been very consistent up until recent. In fact the only real difference you really see in Paul’s technique is very recent, and I have a suspicion he may have devolved arthritis. So if any of it were true, than this would have been a recent thing like two years recent, as part of a physical therapy plan, and not anything that helped him develop his picking at a younger age. He for sure wears hearing aids now.
2: Whether RoME in this sense is applicable or not is irrelevant really. RoME doesn’t even have to be applicable to guitar playing in reality for you to be able to sell it as such. Most of your audience doesn’t know any better anyway and likely won’t question it if you showcase it with conviction, and even if they did, its is all so very anecdotal, that it’s hard to refute. Anecdotal evidence is perfect for salesmanship, because all you need then is that conviction, and to showcase your ability, and you can sell it. Again this isn’t to say it is or isn’t relevant just that it doesn’t need to be.