Byakuya's vice captain already on the spot getting killed by mad science guy.

Yachiru was here!
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It's like this...

Ichigo keeps winning, people complain it's too boring already.

Captains Show face, everyone gets exited and wants to see what hebat things they can do...

After they win, people starts to whine again saying that it's too predictable or not following the storyline.

Don't forget that Ichigo and Friends actually had tonnes of helps from others when they were inside fighting the captains and at the same time, all the captains was not happy that Rukia had to be executed. All of them were holding back againts Ichigo and friends.

Also, so much time has passed and they surely had plenty of practice and training while the small squad were busy trying to protect the small town from small Arrancars.

Makes a little more sense now?

Actually yachiru is not a shinigami... She's Kenpachi's bankai in disguise...

Nah... Ichigo's father will come to save the day.

I don't think Kenpachi requires any Bankai to win. So far he's already on par with an Espada with only his brute force. He probably only needs an extra Kidō skill or 2 and he'll probably be able to win even without Shikai.

Finally no more drags and the story continues on!