Regardless of whether people talked about this somewhere I"m trying trying to be lively.
First off I think he is part of the 0 division and thats why hes not really labeled with any position. It's probably because 0 members don't get labeled like that cause they're special.
Where he is now. He's probably guarding the king's key in a last effort with Hikufune?
Throw at me.
Well all we really know about him is he's exiled himself, volutarily or involutarily, from SS... and he's got the clothing of a captain and comparable strength. TBH anything is possible and Kubo has a thing for bringing back old characters (i.e. Superchunky) so its only a matter of time before we get his history.