Take Luffy and Marco out of the equation because their fruits don’t work like other mythical zoans or just regular zoans. Have we ever seen these 4 forms that you guys claim exist and show me a panel where it says that awakening gives an extra form. Luffy doesn’t count his fruit is Different. Show me prove and I will then agree that kaido will get an extra form.
--Ok I will give a final try
--Luffy's fruit is BASIC "HUMAN" model fruit meaning when luffy tranforms into zoan or hybrid he still remains a human as his fruit is already a human model. If an animal lets say dog would have eaten luffy's DF then they would have two more forms but as both luffy and the fruit in question are humans they cancel each other. So luffy like everyone has 3 forms but in his case as it is a human model we don't see
--Nika looks like a normal human also proving what I said
--Marco has shown 3 forms also his base , full zoan is bird form and partial hybrid form
--If you stilll don't get it nothing I can do