I agree with Madquilter, it's really up to the creator of the piece to decide. I think maybe you are questioning this because you are looking at each element of the block as individual, rather than standing back and looking at the block as a whole. When your quilt is done, you will not just look at one block, you will look at the whole quilt, so the perception will be different.
I hope what I just said made sense....I do go off on a tangent sometimes...Anyway...looking good.