Since you don't provide pictures of the blanks you are considering, I wonder if you may be confusing grain flow with growth rings or figure or fiddleback. The pics Mr. Patton provides exhibit fiddleback perpindicular to the recoil forces, but proper flow through the wrist and head areas. Unfortunatley, many wood sellers are not well versed in layout to produce a sound gunstock. It is often tough to tell if a blank is flat or quarter sawn, dense or porous, sound or punky from a couple small pictures. I've bought a few blanks off E-bay, but passed on many that were too tough to judge for suitability. I have made a few plexiglass templates that I can lay on a blank or slab to see if it will be usable. My two-piece templates are made to encompass most quality older American side and boxlock doubles. Many sawmill operators are surprised to see that a rather large walnut slab may barely yield one suitable two piece stock. The waste pile is always larger than the good pile.
