That stock is quarter grain. Fiddleback occurs naturally, without regard to stock layout. A fiddleback tree is a fiddleback tree. You can usually even see the ripple on the bark before you cut it. Often it goes all the way out the limbs. I have cut trees side by side where one had it and one barely did, or not at all. There is also ripple when the stump wood cut includes the curve from root (horizontal) to trunk (vertical) That curve seems to compress some fiddleback into the wood, even if it disappears as the grain staightens out. Hope I am picturing this helpfully. I will say this--I think it strengthens the wood itself. Steve