Great post M Levac!
I have long asserted that carbs are really not a necessary macronutrient..they are an energy substrates..they don't build anything.

Fats and proteins are structural materials..you build things with these compounds..enzymes, hormones, hair...that's why they are essential.

One big issue with the carb debate as it pertains to "fitness" is that the intake of carbs spares protein..Well they also spare fat!. Why would your body burn fat if you are taking in all this energy in ther form of "easily" burned carbs?

A mistake that a lot of people make when lowering their carbs is not to increase their fat intake..when that happens, precious protein is used as a fuel source instead of helping to build muscle.

I think low carb, low fat is not ideal when it comes to building muscle.

So yes, you can build muscle while in ketosis.