Just for interest (if anyone has an interest), no bearing at all on the game. The dai-kyu is asymmetrical, it's longer at the top and shorter at the bottom. In other words, the grip isn't in the center of the bow. My theory is that the old bushi wanted the power of a long, long bow. More inches of plant fiber springiness/tautness with every extra inch of length. But they wanted to be able to loose arrows from horseback. So they put most of the length overhead, out of the way of the rider's legs and stirrups.
The kyudo (modern version of kyujutsu) bow isn't drawn by the fingers, it's drawn using a special doe skin glove with a kind of hard notch at the base of the thumb and forefinger. And the bows are so strong that they can't be drawn back with just the right hand. Instead, both hands raised overhead and used to equally "stretch" the bow and string apart. Then, the arrow is launched by opening the bowstring and letting it, the bowstring, and the bow respond. In modern kyudo, visual aiming isn't required. Hitting the target only requires being properly aligned to it, and doing the steps to the arrow properly. (Which is quite a bit harder than it sounds).
But things were probably a lot different while shooting from horseback. These videos show that in practice in current times. The annual competitions are called yabusame The Ogasawara clan of Shinano (who may or probably will appear later and have in-game significance) have preserved it for 800 years. Note the very close range of shots, from the backs of moving horses. I'd guess that that's the way it was in our games' time.
Yabusame https://www.youtube.com/watch?v=Zy-ITFpaR3I
Women's and girl's horse care and yabusame https://www.youtube.com/watch?v=DDDvSRCVq_g
Some highlights:
