If the spar cap is otherwise flawless, I would use it. The spar caps are either in tension or in compression when the wing is loaded and that doesn't change with the orientation of the grain. What might change is how it's glued to the webbing and therefore how the forces are transferred into the spar cap material. I'm less clear about the consequences of that. Leonard tested the wing with a 1,000 lb. load. There is a pretty good margin of safety designed into the wing. The level flight loading of the wing for me will be approximately 235 lbs. per wing. That would be my reasoning for my decision with my plane.
Or you could ask you next of kin what they think you should do.
