Im at 4800 and haven't played since December until yesterday. If I do all the new crap then I will be up there. The new elders thing seems pretty stupid to me though.
We're the ones who got bored of Destiny but didn't want to put it down.
In other words, we're the ones who did the ghosts and used pulse rifles and shotguns in PvE when they were shit just for a number.
100 wins in Rumble is the only grimoire that meant anything to me and then they made it top three. Who doesn't love being pro with TLW, Felwinters and god roll Radagast/Ash Factory/BTRD/Jolders.
I think it just shows experience, commitment & addiction to the game.
Yes I said experience because it does show you've used all weapons, abilities, explored & encountered everything in the game.
It does not mean you are better than players with less grimoire than you.