Help understanding Events API for users and admin

Hey box devs,

Can you help me understand how the Events API is to be used?  I imagined in some app integration I could call it and query a subset of events for a user (like the 20 most recent).  However, the way I am seeing the endpoint work is that I have to call this first:

https://api.box.com/2.0/events?stream_position=now

Take the stream_position out of the response and THEN as the user does some actions which create events I can afterwards call something like:

https://api.box.com/2.0/events?stream_position=***card # removed for privacy***

And it responds with the events the user did during the period between the first and second call.  I'm sorry, but I don't understand the use case for this kind of behavior.

If I wanted to make a single call to get a subset of the 20 most recent events for a user, can I do that?

Or even a double call - first to get stream position and second to get actual events would work.  However, if I immediately make the second call with the stream position from first call, the response is an empty array of events.

Additionally, I am unable to make GET requests for admin_logs with the Developer token - PostMan gives me a 403 forbidden.  Can I turn something on to enable this?  My (user?) account that I log into the Developer and normal Box UI has been given admin access - I can see the Admin console/area.