Other Special War Powers?

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Who do you think the other 3 Special War Powers are, we already known Ichigo and Kenpahci are the other 2, but who do you think others are? Uryu could be one but I think he is probably one that Yhwach wants to join as one of his own 'Special War Powers', like he asked Aizen, but we don't know. There could be Kisuke, because of his intellect and since he has now one of those Medallions that can steal bankai and maybe find a way to negate it. Grimmjow could be one since his an Espada and I doubt those Medallion can't steal a Resurrección, so he could be one. Also I think that maybe the Soul King could be one as well, I don't why but I just think that. What do you think?