Comments not showing up when set to open and assigned a region in manage display in drupal 7
My issue was that comments was "CLOSED" for the nodes I already created as the default setting initially was set as "CLOSED". Even thought I set the comment settings to OPEN on the content type, this doesn't affect previously created work. 

Solution was to bulk update all the nodes types to open comments with the following sql:

UPDATE node SET comment = 0 WHERE type LIKE "MY_NODE_TYPE_HERE";