The Battle of Karakura Town Begins!

Yoru Machi knew that Aizen would strike Karakura Town and intended to use its hundred thousand souls and the heavily spiritual land to create the King Key of Creation.

But what was this about ordering Tier Harribel to attack Rukongai in the Soul Society?

Had the Hair Gel Master's strength swelled to the point where he wanted to take down both the Soul Society and the Human World at once?

No, even if he wanted to conquer the Soul Society, shouldn't he have attacked the Seireitei directly? What kind of move was capturing souls in Rukongai?

Naturally, Yoru Machi did not know that, because of him, Aizen's Hogyoku had not fused smoothly as it had in the original plot. That was why he had sent Tier Harribel to Rukongai to gather feed for the Hogyoku.

As long as he made a move against Karakura Town in the Human World, the Thirteen Court Guard Squads would certainly go all out to ensure the Human World's safety. Rukongai was not the Seireitei. Once the Thirteen Court Guard Squads had deployed en masse to the Human World, Tier Harribel and a group of Arrancar underlings would be more than enough to easily smash through the place.

As for why Aizen had chosen Tier Harribel, Yoru Machi's guess was quite simple.

More than half of the Espada had already been killed or wounded. For such an important mission, Aizen would naturally send one of the stronger Espada.

Starrk, No. 1, was a complete slacker. If he were sent to attack Rukongai, he would most likely handle the job passively in the end.

There was even less need to mention Barragan, No. 2. He already harbored rebellious intentions, so entrusting such an important mission to him would be practically handing him leverage.

Ulquiorra, No. 4,