The way that page was set up, once it became a disambiguation page, it was not meant to show every version of every character. It's similar to how Diana Prince doesn't showcase every version of Wonder Woman who has used the name. In anycase, if you do plan on adding all the versions, or at least that version, use a different qualifier, there already is a link to the James Gordon page.
The alias he's been going by is Reverse-Flash. I'm not completely sure he hasn't referred to himself Professor Zoom or Zoom since then, outside of flashbacks, but I do know we consider them separate aliases.
I think all's an overstatement. To my knowledge, Darkseid War occured on PE and neither version of Top was from the future. (If I'm wrong about the second point, could you point it out to me on his page). Maybe User:Spietrasinski meant past? But I will give you the death portion, that correlates with NE. Anyway, I modified that section to hopefully be a little more accurate.
I did some edits to the Image Template not too long ago to make sure all covers are properly categorized. As a consequence, Filetype is now a required field. I saw some of your recent Titans Tomorrow picks lacked one, so I thought I'd drop you a line. Even for mentioned characters, you can just use Character.