No worries, just a matter of filing in the backstory more and more as time goes on.
Basically if it was a Omni that existed at the time and the config uses tech that was available at that time and not something later . . . then it existed. See Gargoyle D vs Gargoyle G . . . G has the APGRs, so it is out even if a LB-20X Garg would have been great- which is why before a lot of these one of the MM servers swapped AC types for more diversity.
Some of these also just came out with the RecGuides, especially ones doing riffs on video game versions- I want to say the Timber Wolf got 2? new configs paying homage to old video games.
Personally I think the Gargoyle D, Stooping Hawk C (never say die, a 'Black Knight' config), and Vapor Eagle are the gems of the list.