User blog comment:Xilinoc/Ch. 598 - The Shooting Star Project (We Only Have To Beat You Mix)/@comment-24934641-20140925180954/@comment-24913480-20140927093644

Faceplant, I think Marijuanna meant that having Ichigo pull another Deus Ex Machina (like Mugetsu) to beat Yhwach would just be bad writing. Kubo has been showing us the development of Ichigo's powers and personality for months now so, of course, we expect that will play a vital role in the final battle. Just shoving all that to the side at the last minute and giving him a completely new, unexplained, god-like power, like in his fight with Aizen, would be terrible and unsatisfying.

Example:

Ichigo: Alright! I finally unlocked my true shinigami powers, forged my zanpakuto and learned about my past and origins. Now it's time to use all that to defeat the bad guy!

Yhwach: No, sorry dude! I'm a god! Logic and hardwork don't work on me.

Ichigo: Oh man! Wait, I know! I'll just use this cheat code and effortlessly win with the power of hack. Mugetsu.02 I choose you!!!!!!

Yhwach: What was I thinking?! I never stood a chance!

^This would be bullsh*t.