Sorry I'm away from home for another week and not really in a position to really investigate, but does Marie really exist, but her surname is Unknown, or is she and her husband effectively invented?
I'm also not sure if she is usually connected to the Gaston legendary ancestry, which is what I was working on at one point, as there appears to be only 1 of the profiles that connect her to Jean and Agnes as parents. Perhaps she can be disconnected from them? Also it looks like the parents for that profile could be merged with the grandparents, but I can look at that once I am back home.
I agree though we should hold off on the merge until some of these questions are sorted out.