@cdlara381 I have not read those studies so I cannot speak to them. What I think is our bodies will not use more protein than 6-7% of the calories we eat, so why try to force something that is never going to happen?
Something I know about muscles is they are made primarily out of fast and slow twitch muscle fibers. Both type get stronger the more you use them, but only the fast twitch fibers get bigger. If you want to SEE your muscles grow, do your exercises at a fast pace. Genetics and which muscles they are will determine if you have more fast or slow twitch muscle fibers, but figure you have roughly a 50/50 split of each type. If you want smaller, but still strong muscles, exercise at a slow pace.
Muscle is also an active tissue that requires calories, even when you're at rest. The more muscle you have, the more calories your body burns in a day just being here. Eating more protein/calories than you need is not how you can loose weight. I did not read a study to know that - I just lived the last 55 years.