Is there a way to change the owner of a dashboard? Or can we have more than one owner of a dashboard?
Unfortunately both are impossible. The “Sharing settings” in Kanbanchi are provided by Google Drive and it does not allow more than one owner to be added. Also you cannot change the dashboard owner (unlike Docs and Sheets).
An alternative way is to share your dashboard with your colleague, who you want to see as the owner. Then he must сopy your dashboard into his Google Drive.
All settings will be copied, excluding comments, sharing settings, notifications and dates in Google Calendar. Permissions of attached files also must be checked, because original files belong to you and are placed in your Drive.