Visored

For example, Wonderweiss Margela, who was created to counter Yamamoto, would never get the chance to use his abilities and would get thrashed in hand-to-hand combat instead.

The rest of the top three Espada wouldn't fare any better, as they'd get stopped by the Visoreds, who are much stronger now because of their training with Ichigo.

Their power, combined with the rest of the Gotei 13 captains, would completely overwhelm the three Espada, and they'd be quickly defeated.

This would finally force Aizen to step onto the battlefield himself, and Ichigo would be right there waiting for him.