You can feed Primal raw for 1 meal, Grandma Lucy's for another & leave kibble out if you'd like or give as a meal b4 bedtime.
I had a very finicky eater, she loves all her meal x's now. They eat mostly Primal & occasionally Stella & Chewy's. I used to feed them smallbatch too.
This is from smallbatch site:
Support | smallbatch pets Can I mix raw with kibble?
Simply put, it’s really not recommended. Mixing the two is sometimes the only way to transition from kibble to raw, but it may actually put more strain on the digestive system because they digest at different rates. Raw food is much more digestible, taking only 3-4 hours, while kibble usually takes 9-12 hours. That’s a big difference! Kibble is cooked and processed therefore it’s harder for your pet to digest because the molecules are bound tighter together. So, when raw and kibble are mixed together the raw will digest, leaving some of the kibble to rise to body temperature and ferment. Bacteria level in your pet’s digestive system will then rise and can cause some unwanted problems. Eeeep! No one wants that. If you are feeding both raw and kibble we suggest you alternate the two. For instance, feed raw for breakfast and kibble for dinner or vice versa.