From what I've been reading. It's somewhat insinuated early in the manga that his father has retired from it. Thus making him the last one.

What I want to know is, are Judha's men already dead. Because it sounds they are.

his father disowned the title quincy and wants nothing to do with it

going back to uruhara, chad and orihime! are they still in hueco mundo "preparing"

Somehow this will all be going according to Aizens' master plan

I want them to bring Grimmjow back somehow, they brought Halibel why not friken Grimmjow.

Revival in anime works in one of two ways:
1) To revive one of the main "good guy" characters. This method will only be used after a ton of more suitable subjects will have already died. Usually used to bring back a popular character who just sucks so much that the writer wants to kill him off again. This method will invariably cost a life in order to be performed, thus leaving the newly revived hero and their companions in mourning (even if the one performing it was someone who had just been trying to kill them 6 chapters ago).

2) To bring the "big bad" back. This method is usually used towards the end of the series just when the heroes think they have won. Usually used to bring back the main antagonists' group actual leader. This method will usually cost the lives of the remaining antagonists in order to be performed, however the big bad outclasses the entire group to such a degree that he can usually stomp the heroes until they gain some "unforeseen and mysterious power" to defeat him (usually involving the power of their emotions or hope).

Wasn't he breifly seen in an earlier chapter. Plus there was some artwork with him Orihime and sado together sometime at the begining of the year.

its suggested that grimmjow is with uruhara in hueco mundo. but i dnno if i prefer him over halibel

he probally is he didnt die