I disagree with calling the crack a defect.  I would call anything that would lead to the final failure of the bow a "defect".  Those cracks running with the grain don't even effect the performance of the bow.  Defect, no.   Character, YES, YES, YES.  
That bow must have been a tough tillering job with all the knots, lumps, cracks and what have you.  You really did a great job on this bow, I congratulate you on a job well done.  I bet any one of us on this website would be excited to have a bow like this one.  Thanks for posting this to share with us, }|{opukc.