My opinion....once it goes dormant chop at the first branch to get rid of the the scarring above the branch. Wire that branch up as the new leader. Next year let it grow wild and then cut again in fall. Remember to remove the wire before it cuts into the new leader.
Ebihara in the future?Yeah, im not chopping now. Im expecting its rubrum because it was under my japanese maple with all the other rubrum seedlings. If it isnt, I would be surprised. We'll see what the leaves look like next year.
Rubrums have a huge genetic range. Leaf shape can vary substantially. I'd say it's a rubrum judging by the light bark and the new growth is a dark red.Leaf looks weird for Rubrum.
I have a bunch of Rubrums starting up too.
What are you plans?
I dont chop before winter, not saying you can't, but I don't like wounding the tree as it goes dormant....basically a guarantee for some dieback.