Hmmm, full Dutch sun or very new growth?
Almost all of these from seed are a different color.
When you get a nice one like that you clone it.
Ah, yes, he did say it was layered above the graft. I have only grown seedlings from a tree that is a cross between atropurpureum and a green. About one in a hundred seeds come out in the red color, often reverting to green after a season or two. The reds are weak until the third or fourth season, but grow well once they're established.
I did put wire on the trunk above the graft yes next spring ill dig it out to see if roots are formed above the graft
Ill try to root some twigs next season
Also going to monitor the sun hours next year to see how much it affects the collor of the leaves