Hi,
There is no need to copy structure node for initial. Initial content are optional and content authors can remove content if not required but from structure they can't. So having same content/node for initial and structure makes no sense for initial.
If you want to add content for initial you can do it from template editor.
- Go to structure mode and unlock structure components
- Switch to initial content and add author initial content
For second observation - this is the behaviour. when you create any page from template, a node structure is created for content node based on template, if you modify the template it won't impact the page until it is structure change. So the changes will be reflecting only for new pages.
In your case you can write a script to modify existing pages with new initial content.
Thanks
Arun
Arun Patidar