So the nobodies that made up Organisation XIII are now human again and have chosen to form Organisatio XIII (-1) again?

Why would Xehanort want to round up Xemnas' old crew? He traveled through time to find 13 better bodies to house his heart. Braig and Isa wouldn't join the new Org XII because they're already Xeahanort-hybrids and Lea wouldn't join because he's a Keyblade wielder now and fights alongside Sora. So that just leaves Dilan, Even, Aeleus, Ienzo, Emyd, Rould, Lumaria and Elenar: the rejects.