My response was that reach is an advantage, but not the biggest one. The biggest one is speed (IMO, regarding point sparring). Nowhere did I say anything about not gaining muscle. Lopez, the example I referenced, may be faster if he gained more muscle, he may not be, but I didn't use him as an example of why not to gain muscle.
Do people who are tall and lanky typically do better at point sparring? I would think the reach advantage would be an even bigger advantage in point sparring so give people who are taller, and probably thinner, an advantage perpetuating a false notion that being muscular is not desirable for fighting.