Shane, when the Cannonball starts having fruits, I will be posting the fruits as it grows and matures. It is starting to take off, I'm cutting some other grafted branches (Seedless Krueger, Russell, Marcus Pumpkin) that are in the way of its sunshine. All my grafts are growing well, even the newly grafted Santa Clara Gold. I will need to check with Julie, she didn't mention that large fruit variety to me. She does have Queen and Daily 11 on her trees. She usually has connections so she can get a lot of new ones.
I do make sure any scions I put on my one large avocado tree is clean. If I see any funny growth, leaves or symptoms on a graft, I cut it off and get rid of it, never wait until it effects the rest of my tree. I did have one incident with a loquat I got from a trade, it almost killed back half my tree but it has recovered since.
Lucky for me my 20 yr old rootstock avocado seedling tree is from a Hawaiin giant avocado fruit (4lb) that I ate and planted the seed. It is a super vigorous tree and probably immune to many virus or bugs, it grows so fast, maybe 15ft every year. So far the most vigorous of my grafted avocado is the HI Russell photo shown above.