I guess this may be one of the only times the Inheritance Principle will not have unintended consequences for .bvec files. Since all of my DWI data is non-directional single volume data, I can have a single .bval and .bvec file in the bids root that will act as a surrogate for all the dwi images in all the folders, right? In general, I think the inheritance principle can have unintended consequences for bvec files, as it reports vectors in image space, so an identical sequence will create different bvecs for different image angulation.