I think the trick for vegetarian or vegan is to eat often, and to combine the protein with fibers, fats and carbs because this is what plant based eaters in general do, this way protein still trickles into your system to get better utilized. And this is just for bodybuilding, you don't need these powders and shit it just makes it easier when bodybuilding to get high protein.
Predators need more sleep, eat seldom and fast, and lots at one sitting. Because meat digest slowly.