Been suggested many times in the past but now is probably the best possible time to implement it. This new addition would show what ranks you had on each of the 4 realms before they merge into one. https://gyazo.com/c9ead8c3bb9763bfe0ec69fda182fe01 This would be displayed under the Moderator rank.
It’s very possible as they already use MineSync, they just haven’t implemented the rank usage. It may be an issue with their permissions plugin as I know it is somewhat or mostly custom, but it isn’t that hard. +1
Now, although it is a cool suggestion it will have to be a -1 for me because when I go on cosmic forums and people post messages on threads you see their name and their 1 million ranks and that in my opinion just doesn't look good and is unorganized. Now, I know there is only 1 realm at the moment but as the server progresses I presume there will be more realms and that is just rank after rank.
Cosmic had 20+ realms. TW has only had a maximum 8 and this was a thing previously. Also, Cosmic has extra roles such as Cosmic Client Beta, Top+ ranks, etc.
As I said I'm aware that TreasureWars has only 1 realm at the moment but if there are more to come then ranks will pile under names. That in my personal opinion looks ugly.
I doubt it would. Plus there is an option to only show your highest user banner which could be an option.
The rank banners themselves do still in fact exist in the websites EXTRA.CSS: https://gyazo.com/08b63afd5ee88a7257663d832bcf2aa5 There's Pirate but Frozen, Bandit, Reforged, Haunted, Forgotten, Cursed, and Molten also exist.