Brian
Lets get this into to perspective there are only a few sites where you can get the date to upload to GRAMPS and the main DNA source Ancestry is not one of them.
My database is some 18000 people of which less than 400 have DNA matches
and of those only 30 have segment maps (DNA Associations).
I never use Deep Connections it is too slow and processor intensive to be worth the effort.
I have done some trials on my database between the home person and a person with a DNA Association and a sibling without, there is no difference in the reported relationship using Utilities/Relationship Calculator
Hope this information is helpful.
phil