You will use all protein you take in, you will always turn a percentage of that protein into energy. Your body is perfectly happy burning protein as fuel and the more protein you eat, the higher percentage will be burned as fuel. The more carbs and fats you eat with the protein, the less protein will be burned as fuel. It is likely that you would have to consume an incredibly small amount of protein to prevent any of it from being burned as fuel, the goal isn't to prevent protein used for energy, the goal is to MAINTAIN a small amount of protein used for energy (i.e. a positive nitrogen balance, nitrogen from the breakdown of protein into energy). Is there any advantage to extra protein beyond maintaining a positive nitrogen balance? Perhaps, but this would probably be from digestion over time more than anything else.
A pound of muscle will only require less than 100g of protein to build, HOWEVER there will be a SIGNIFICANT energy requirement to synthesize this muscle (out of the protein, the energy will not come from this protein used to build it).
Here is an interesting note, when going from natty to enhanced, and working with muscle memory, I think most of us have experienced muscle growth at very high rates, not just water, but quality muscle can go on at an ungodly rate when it's all muscle memory and everything is primed perfect. I've noticed that during this time, large amounts of protein OR small amounts of protein have very little impact on this hyper growth period. I can even restrict calories and grow in these periods.
Here is another point, anything you do to one macro, you do to other macros. When you increase protein, you must decrease fat and/or carbs. If you decrease protein, you can eat more fat and/or carbs. This equation isn't just about protein, carbs are anabolic, fat is anabolic. There is an optimal level of each, if you increase one, you lower the other(s). It's all about what is "enough" of each macro.