There are quite a few coincidences between Luke Dye and these Harbours.
I found this: http://userdb.rootsweb.ancestry.com/marriages/cgi-bin/marria...
Notice who the name of the witness is at the bottom and who the spouse is. This is the same David Harbour I presume that is in the court record. And I believe that David's sister, Nancy Harbour, married to Luke Dye. Dye is a family name as it is my middle name as well.
All this is very intriguing the only issue is I simply cannot find any evidence linking them to Luke Dye Harber.
In other interest, there seems to have been a clan of Harbours in Madison County, KY that very well may be related.
I believe the fact that Luke's father was born in Virginia, but had Luke in KY may be a good clue to narrow things down.