Sap is really slow in my pines now. I agree.
That's not risky, that's a safe place to be.
What you can do however is 1st the Irish moss if not already, and the 2 or 3 cuts I mentioned.
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On the right keeper branch just cut the new shoot back. New buds will form next Spring if I remember Vances tutorial correctly.
That branch is thicker than the 1st Left branch, and left to go in the same direction/vigour, will never change that.
Sooner the better.
The opposite branch(es) will need to go for whatever design comes, and why not put that energy into keepers and back buds?
Leave 1/4" stub there and seal it. + it's part of at least a 3 way whorl which will thicken at the trunk more and more every year.
That said, the 2 lowest branches, leave them opposite each other to build the cultivar closer to the root stock thickness, though
taper is good, you'll know when to lop off the inside curve branch and other small branch at the union.
Could be another Mugo, could be Scotts pine. Not really, not knowing. Hopefully they don't get out of sync too bad
but coming from nursery, they are probably not grafted for bonsai use, and in the landscape it doesn't really matter for most folks.
So they had 10 of them huh? I would be willing to pay sh/h if you could pick such a similar nice specimen and ship it my way.
How much are they charging for this 1 gallon? size?