2) Yes, you can pass back any Intent, even the one that started the child-activity. You don't need to create a brand new one.
When an Intent is passed back or forth between Activities (starting an activity / setResult+finishing), the other end (getIntent() / Intent in the onActivityResult) doesn't get the exact same instance of the Intent. Instead, it'll get a copy of it as an Intent with the exact same contents. As a comparison: Intents are passed by copy, not by value or reference :-)
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