I can certainly tell you that a kitten who is on a raw/quality canned diet WILL develop more muscle mass than a kitten on kibble or low quality food. That in itself is proof that meat protein is so important in the development of the kitten.
You could always ask your vet where in a carnivore's diet corn/wheat gluten fits in?
Cat maid to:
Jasper, male Ragdoll ?? (approx 10 yrs)
Sweet Pea, female silver tabby DSH (approx 8 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 7 yrs)
Puddles RIP (1996-2014
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey