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IBM_TangPengIBM_TangPeng 

order of component creation

dear all
cloud anyone help me to understand the image as below.
My questions are 
1. what does the root.cmp mean. does it mean  The root-level tag of every component  <aura:component> ?
Every component inherits the body attribute from <aura:component> so if it means  the aura framework instantiates <aura:component> firstly ?
2.next step the framework will goes through the children of the v.body facet to create each component v.body.
but I can not understand why child.cmp is 2 not parent.cmp or subchild2.cmp ?

User-added image
thanks in advanced