Ryan Gill uses a short draw and long arrows. With a very stiff bow. So in those cases, arrow spine is not as sensitive, as a lot of the arrow is already pointing downrange at release. The arrow needs to be stiff enough not to snap the fletching end off when you release. Also, he uses cane, which is tapered and has unique attributes. So for such things, spine is less critical to shot placement, when compared to long-draw, short as possible lower weight bows.
