It's really hard to say. On one hand, we haven't seen any of the zero divisions true power, not to mention that they won't be able to use their bankai against the enemy.
As for the Juha, he's mostly dominated the fight so far so he is quite powerful. He's also got a medallion that is able to steal a shinigami's bankai. Not to mention use that bankai against them (though it is weaker than the original owner.)
For now, it looks like Ichigo is gonna be soul society's ace in the hole again, just like he was against Aizen.
What really bugs me is that guy Haschwalth, he seems a lot more powerful than he lets on. I get the feeling that he might be more powerful that Juhabach.