For 10 years, The Black-Green-Red flag was the one and only flag shown on the Wikipedia page. It was changed on October 14th, 2017 By wikipedia user 2606:6000:608E:1500:CE4:722A:4988:89B4, Although the file itself ( File:Горская Республика.png ) was uploaded back in November 2016.
Arguments in favour of the Black-Green-Red flag Edit
Longevity: The Black-Green-Red flag was used and undisputed for 10 years. Why would not one single person object to the flag?
- Note that there might have actually been disputes i haven't found yet. I'll update as i come to new info.
Sources: The Black-Green-Red flag is cited on wikipedia as being from FOTW (Flags of the world, Possibly)
- Note that Flags of the world does not have the Black-Green-Red flag on http://www.crwflags.com/fotw/flags
Arguments in favour of the Crescent flag Edit
Sources: According to /u/NuclearElevator on reddit, The Crescent flag has been supported by the Atlas of the Ethno-Political History of the Caucasus, A book from 2014. I'll hopefully look up where that Atlas got the flag from. It has also been given as a source by Vexillographia