I believe the problem is that AAM, when installed, automatically assigns you the Super Admin role. This is ok on a Multisite, but maybe unnecessary on a WP regular install.
I decided to uninstall the AAM plugin and install the Members plugin. When I revised the permissions using the Members plugin, I noticed that the Admin role actually had more permissions activated than the Super Admin role. I decided to take a closer look, and discovered that all the permissions related to Document Revisions where deactivated on the Super Admin Role (the role that AAM assigned my account - it stuck even after uninstalling it). On the contrary, all the permissions related to Document Revisions on the Admin role were activated. I believe that's why the Admin role had more permissions than the Super Admn role, and why I can see Document Revisions on any Admin account I create, but can't see it on the Super Admin account.
Maybe a work-around for this could be to temporarily install the Members plugin to fix the permissions on the Super Admin role. But I cannot confirm this, as I uninstalled AAM completely and decided to stick with the Members plugin.
If someone decides to test this out, please post back so we know if it works.