I don't think so. Two privaron espada, Churichi with fought with Ishida, and that afro guy who fought with Chad didn't had zanpakto in katana form, and they weren't strongest privaron, imho strongest fought with ichigo and he had ordinary katana.
i just think its big cos he wants it to be. captain class control its size remember, so maybe he just didnt make it as small as others (maybe to appear very strong).
plus regarding the shape, its doesn't seem to have to be a katana (especially with arrancar.
Yeah, and there's a vizard who has a soulcutter that resembles more a knife, but it doesn't mean that he is weak or anything. Like Isshin has said at these levels you can't use the size to judge the rejatsu, because everyone strong as a capitain would have a sword huge like a palace. I mean, look at Aizen's case: with is rajatsu he has a sword so small... Even kempachi's sword isn't huge. but ht e best example is Aizen. he is the strongest guy around and has a sword perfectly normal.
Not all the arrancar have used katana-type zanpaktou. Gamenbien, Chirrcuiiu, Telsa, and Wonderwise have all had non-katana zankatou as well.
Now, what this thread should really be about, is that Noitora's zanpaktou can seemingly change size. At the meeting, and with Ulquiorra, he had the chain in his pants, but the weapon wasn't visible. And, in the last chapter, his zanpaktou seemed larger than when he used it against Chad to me.
hmm but all in all, I don't mind Noitora's weapon, is quite cool to me hyhy
But what if Noitora has such weapon, because his like Zaraki in Gotei13? Maybe he just depends on his won raw power, and don;t want to fight with realsed state/ or he can/t? That would be similarity <half-joke>
i don't really think that it affect anything. other character also have zanpaktos that aren't katanas. another thing is that maybe he is just changing the shape of his zanpakto to fool his opponent or something.