If there is such a new rank, it should be a rank for oustanding guys, so I suggest this new rank requires 4000 merits at least, not 2000. Someone hits that rank will be a precious asset of the forum. I discussed about the more common words in the forum, self-made here. There might be no extra benefit for users at such rank, but they will enjoy it as a honor for their huge contributions here.
I made that mistake myself a few weeks ago thinking the same but a user corrected me in saying that self-made Legendaries are those users that reach Legendary rank from Newbie rank.
I knew it, but I still would prefer to use the name-calling, self-made, because I think we should not make things become overcomplicated like this. Self-made, half-self-made, and so forth. Basically, the implications behind the self-made name-calling is to disclose that such users have made good contributions in the forum, and they received enough merits to move up from lower ranks to higher ranks. That's all. There is LoyceV, whom received nearly 3000 Merits till now. LoyceV is clearly not a self-made Legendary, but probably worths more than most of upcoming self-made Legendary users.