[sXBL] question on the <content> processing model

I'm not quite clear on exactly what <content> does, or more precisely on which 
nodes it operates.  Section 4.2 talks about "explicit children", but consider 
the situation represented by the diagram in that section -- node 3 has an sXBL 
binding bound to it which makes nodes 4 and 5 children of the leftmost purple 
node (call it node A) in the flattened tree.

Now say node A has an sXBL binding bound to it, and this binding has <content> 
elements.  Would those be able to reposition node 4 and node 5 in the flattened 
tree under node A?  It seems that the intent is that they should, yet node 4 and 
node 5 are not at all explicit children of node A...  Some clarification here 
would be nice.

-Boris