Lucky Cross and Little Lucky just kind of happened, with help from a NC gardening friend, Larry. I just went back to my records (they are on line - link below)
http://nctomatoman.topcities.com/See...amilyTrees.ppt
scroll to the various Brandywine F2 pages - it is in power point.
One of the F2s I grew out in 1998 was potato leaf, medium sized smooth oblate and bicolored, and did have excellent flavor. I shared that with my friend Larry, who grew it out and saved seed - he sent that seed back to me; I grew out a few and the starts of both Little Lucky (smaller and rounder than the F2) and Lucky Cross (larger than the F2) emerged.
I think that there are probably other very good tomatoes in the material here, and have only scratched the surface.
Of the original hybrid, I've grown out 15 F2s, and from those, only 3 F3s, 2 F4s, etc - unusual things were still popping out in the F5 generation (grown out 8 of those), etc - it is a very tangled story, which you will get a taste of if you try to sort your way through that link!