Quote Originally Posted by tgva8889 View Post
I'm pretty sure you can't "get around" a Garganta, since I've seen no indication that an Arrancar couldn't just make it as big as they wanted or something. I mean, if Ulquiorra can make television screens out of them, who knows?
In all cases shown, Garganta takes a while to open in full. So an attack, or part of one, could strike past a blocking attempt before the tunnel is ready, even if an Arrancar can create as big one as he wants.

Personally, I think the size is limited somewhat by the one creating the Garganta; in all Canon occasions, the tears have been just large enough to let the person, or group of persons, pass. The largest tears were created by Hollows that were physically largest as well.