Could these be cooked in the slow cooker all day instead of soaking overnight and then cooking at high heat?

His recipe leans heavily on the soaking, and the reason is because it turns the soaking water basically into a kind of dried corn stock, which later flavors the grits. But that's not to say the slow-cooker method wouldn't work—I just haven't tried it. If you do, please let us know how it works out!