I have noticed a trend lately in grain free foods, both dry and wet, of having green pea or pea protein in them. Seems like the majority of the affordable high protein grain free dry foods have this listed in the first 5 ingredients. Is pea/pea protein even digestible? Does it actually offer any nutrition or is it a filler used to artificially up the protein counts in grain free food (similar to how corn gluten is used in cheap cat foods to up protein)? Opinions?