Thanks for the info.
So in your opinion would it be worth it to graft it to guarantee a true Saigon or just leave it as is?
My thinking is that if you want a true duplicate of the Saigon, perhaps you wait until your seedling develops some branches and then graft on to a couple of those branches. That way you are more assured of having the exact same variety for part of the tree and still see fruiting from the original seedling down the road.
With cloning you should see fruit more quickly by at least a couple of years, albeit probably not a lot early on. Be sure to label the grafted branches so that when they do start producing fruit, they are easier to identify.
Just my thoughts and with a little luck others will chime in soon with their insights.