There's a way to edit a calendar that's super hidden (I don't even know where to find it anymore minus that it's in my history) called My Calendars at /wiki/calendar/mycalendar.action. From there, you can remove added calendars and edit a variety of features that aren't allowed from an embedded calendar.
Is there a way for me to share ownership of those calendars with other users so that if they were to go to that same page, they would be able to see the shared calendar?
The page mentioned on your description is related to the calendar of the logged user. So if you want the other users to see the same calendars that you have on your own calendar, they need to add the same calendars you've got.
See this page to get an overview: https://confluence.atlassian.com/teamcal/team-calendars-quick-tour-241566246.html
i hope it helps,
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