The thing to remember about True Organization XIII is that they are all seekers of darkness
That being established, I doubt that any of the former apprentices to Ansem the Wise (save for Braig who was in on it from the beginning), are eager to rejoin the organization.
I'm sure Xehanort managed to turn the apprentices against Ansem the Wise by manipulating Even and Ienzo's natural curiousty as scientists, and Dilan and Aeleus' desire to better protect their home from threats like the Unversed via understanding the nature of darkness and the heart.
KH3D showed that while Xehanort williningly gave up his heart, he forced the others to with his keyblade, and then manipulated their desire to be whole again to form the original organization.
As nobodies, they we're not evil, more like sociopaths (though Xaldin was kind of a prick). They did not seek darkness, only to be complete again.
Now that they have their hearts back, they'll return to their normal lives, serving/restoring Radiant Garden, and trying to undo the damage Xehanort has wrought.
Meanwhile the new organization might be comprised of:
I. Master Xehanort
II. Xemnas
III. Ansem (Seeker of Darkness)
IV. Xigbar
V. No Heart (Xehanort in his prime, how could he not be there?)
VI. Vanitas
VII. Saix
VIII. Terranort (before memory loss)
IX. Apprentice Xehanort (Terranort after memory loss, but with all of Ansem the Wise's knowledge of the heart)
X. Riku-Ansem
XI. Maleficent (I know it seems unlikely, because Maleficent is a badass, all-powerful, scheming, hard-as-hell-to-kill manipulator of darkness, but that's exactly why she's a perfect candidate. Plus, Xehanort has proven before that for all her power, she really is just another pawn in his game. When you get right down to it, they want the same thing, but Xehanort is far more powerful and wiser in the matters of darkness and Kingdom Hearts, and Maleficent really owes everything she knows at this point to him. Methinks that he manipulated Maleficient from the beginning of BBS just like he did with Braig for the sole purpose of taking over her heart in the end. The only reason he hasn't done so as of yet is because she is elusive, and actually serves him quite well on her own, releasing heartless and darkness into other worlds and collecting princesses. A seeker of darkness indeed.)
XII. Young Xehanort
XIII. Sora's Heartless (let's face it, Xehanort wanted either Sora or Roxas for the organization, but they won't join because they are too pure and independant. A man as smart as Xehanort will probably find a way to extract the untapped darkness within Sora's heart like he did with Ventus.)