Kind of want to see Brett's rut

I have a feeling Brett doesn't have a rut cycle. Or something is wrong with him because it’s weird when their been together about half year now and Brett never invited Hayden to his rut…or maybe because they only agreed to deal with Hayden's rut cycle, so Brett's was not mentioned. I wonder if Brett handled it himself or asked someone other than Hayden for help…readers won't like this so I believe in the theory that Brett doesn't have a rut cycle, or it's less than Hayden's so the time hasn't come yet