i didn't start reading the manga until the grimmjow fight, just watch anime up til that point, but i remember people saying he was filler. so i doubt we'll see a return from him no more than we'll see a return from that bounto that hitsugaya thought he killed and that exiled (thought still in SS?) shinigami that created the bounto. the chick survived the end of the arc and yourichi took the bounto to her hiding place.
and nobody's mentioned ashido since, thinks that it for him..... too bad tho... he could have made an interesting character. i mean being trapped in constant combat for hundreds of years trying to readjust to moments of peace. then there's that captain america aspect where he has to get used to all the changes that have happened since he was away, example, what if one of the vaizard was his captain? even better what if he was in squad3? so now his former captain is a hollow hybrid and outcast from SS, and his former vice captain is the greatest threat to soul society. if they brought him back and explored the character he could become an instant favorite, but sadly, we may never see him again
