Atemoya Graft ID kind of, is it a rootstock shoot?

[TerraFrutisEcuador]

I can’t tell if the left branch is from the rootstock or from the grafted geffner Atemoya scion.. this came from Excalibur nursery a couple weeks ago. Kind of valueable right now because I don’t have much material and don’t want to make the mistake of using scions of a rootstock. And of course I want to multiply it as fast as possible onto soursop rootstocks I have waiting.

[Guanabanus]

The thicker trunk appears to be the scion.   Double-check when the new foliage grows.