I do see the inception possibilities of putting one as a root stock for another creating seed from that and going crazy. Just reminds me of the dwarf tomato project creating hundreds of new varieties from early crosses that people shared so yes I see that it could get quite Complex with intricate grafting multiple varieties on one root stock.
Did the dwarf project use grafts? Or are you just talking about normal crosses?
No I don’t think they did.
I was more thinking that crossing grafts adds and additional crossing opportunities which increases the complexity of a program or project.
I can’t find the talks in my YouTube history but he probably covers all the crosses in these:
Craig
Webinar
“ By the end of 2005 Patrina had successfully made 8 crosses and she and Craig decided to use this material to start a project where anyone (who wanted to help grow the many generations that would be needed to stabilise new varieties) could volunteer to grow some plants. The goal was to create a selection of tastes, colours and sizes that would equal heirloom varieties with plants having an advantage of being more compact and therefore more manageable. Volunteers were given the opportunity to name any new novel dwarf tomato type they discovered in appreciation for helping in the project.”
Shane, I was just reading your article here:
And I was going to post a comment on your blog, but it wanted me to log in, and I don’t have an account there, so I decided to just post my thought here instead. 
Totally random thought, but it occurred to me reading this. It is possible to graft animals, too – we usually call it organ donation. (In fact, don’t we refer to skin transplantation as “skin grafts”?) And I think that adds extra weight to your point, because there’s documentation that a little DNA can get shared between donated organ and organ recipient. So it makes perfect sense that there would be a little genetic information sharing between scion and rootstock in plants, too.
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Haha, it’s my article, not @ShaneS but I’ll have a stab anyway. From what he’s told me, there’s a whole host of evidence out there that people’s personality’s can change after organ transplant, even with memories of the host. @Ascentropic also talked to me about this too.
I’m sure these guys can say more, and Google won’t be far away.
Oh, sorry I mixed you up! Thanks for correcting me. 
Yeah, it’s very interesting the way DNA can pass between organisms in non-obvious ways.
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