He seems to have a shallow palate and a bigger tongue so a single jointed snaffle would not work as it would have a ''nutcracker'' effect and hit him in the roof of the mouth and pinch his jaw. I also considered a double jointed snaffle bit. To me it seems like it would be hard for Kai to ''hold it'' and have control on how it lays in his mouth. I really like the idea of a bit that is one piece, made of rubber and very flexible- so much so that I could easily bend it in a circle if I wanted to. I feel that the benefits of such a bit are as follows: it will not have a nutcracker effect but will conform to his mouth jut enough for his comfort, and will be much lighter than other bits therefore resting much more comfortably on the tongue and bars and, as it is one piece, he will have increased control over it which will encourage him to salivate. I also like the idea of the bit being softer and making it even more gentle for Kai.
The only problem now is that I have to find a bit like that. I know they exist! We went to Equestrian Closet and found a 5'' snaffle bit covered in rubber. I liked it because unlike other rubber coated bits this one was not chunky at all. It was only 10$. I will still be looking for the bit I described but this one will do for now. I will not attach reins to it as not to make it pinch but I think it will work great for friendly game.