Board Thread:Questions and Answers/@comment-4310945-20140227234231/@comment-11051098-20140422141022

The war is far from over yet. Only a handful of Sternritter has been defeated or killed, and 3 hasn't even been shown yet. It's too early to conclude Kubo have forgotten those characters.

Kûkaku and Ganju will likely play a role at some point, they both have power and techniques of their own to fight with. Kugo, Tsukishima and Giriko will likely play a role too, it would be useless of Kubo to bring them back if it was for nothing.

Chad and Orihime will probably participate some way. Dondochakka and Pesche, I don't know, they haven't shown to be capable of much yet except their Cero Sincretio, which they didn't even manage to do much with. Nel could help out in the war if she could return to her adult form permanently, maybe Kisuke could find a way to help her.

Harribel is imprisoned, but her Fracción might be able to fight. They could perhaps summon Ayon to go on a rampage. Grimmjow will likely fight too, he too would be useless to bring back for nothing.