yea i guess when murmasa said your zanpakutou is free from imprisonment..he's saying that they don't respect their zanpakutou's as much as they used to and they just treat them as weapons when it's suppose to be a part of themselves. so they've taking physical form to show how strong they really are. great filler. finally one that doesn't backtrack or doesn't have any action in it. =]
It can not be kenpachis Zanpakto he killed his master and kenpanhi does not have shikai or bankai they say that in the manga and the anime that you first learn the name to get shikai and beat it in combat to get bankai.kenpachi eventualay shows up.but i don't hink they try to materialize it.and if you think that just because it looks weird that it a shikai then your wrong ichigo's in a non released form is huge and strange looking but his shikai is like a cleaver and his bankia is like as katana. And urahras sanpakto is a acane and a sword when not released.