Just another high-protein protein source to up/maintain the protein percentage of without putting a more costly animal protein product in the food. What's more expensive to include? Chicken, chicken meal, chicken by products or peas? I really think this is more about looking at ingredients than brands. Even Science Diet appears to have a decent recipe in its Healthy Advantage Adult Small Bites but they have some that look to be severely lacking in animal protein and heavily focused on vegetable proteins.