Three questions:
1. Do the top-only entries compete with completed quilts?
2. What's the reason for judging the back of a quilt top?
3. Do competitions allow entries that have been sent out for quilting? (i.e., made by one person, quilted by another)
A category for "tops only" makes sense to me. It could have its own list of judging criteria for the skills involved, but completely separate from the competition for completed quilts.
Judging the backs of quilts is like the motion picture industry giving an Academy Award for Tidiest Sound Stage.
If the answer to #3 is yes, do the two share the recognition/award?