You just gotta feel on in there, as if you were going to pick it up by the base of the trunk.
I'd say about 3 of 12 will have good single trunks, 1 of those 3 will be good to use. Or, not straight up for 5 inches then spidered.
I guess that's not to say some of the multi trunks are no good, they do seperate easily, it's just I only ever have $ for one, and the biggest trunk is usually a single plant.
In spring they all kinda look the same, in fall, they will have long runners, this can help identify very healthy/large trunks. Or provide the gusto for building new sections altogether.
Dude just posted a pic of a Nana that was wholly pruned except for what will remain as parts that have to be cut back to a tree. To me, that is a lot of uneccesary strength Removal.
If you do any cutting initially, separate out the future tree in your mind, and apply all your pruning to it, to get branches closer. While just guy wiring Future unused stuff out of the way of your tree.
That way, your strength engine remains closer to 100, and you've actually made good strides towards building your future tree.
If you cut everything off that won't be your tree, you are left with the need to remove more of your strength engine. Them how to develop the tree? Super slowly. Screw that.
Usually the trunks are such that you can simply trim it to the pot edge and let it regrow, this way you get close buds and some taper going. If the base is great but no other direction is present, I usually hit em like that.
Sorce