One interesting fanfiction could be about the secret training regimes within Gotei 13. It might explore how different squads have unique ways of honing their skills that were not shown in the original Bleach series.
Well, in this kind of fanfiction, one possibility is that the Gotei 13 members might be amazed by Ichigo's growth. They could see his new powers and techniques during the fight with Ulquiorra. Maybe they would start to respect him more as a true force to be reckoned with in the Soul Society.
I'm not sure of a specific one titled 'Gotei 13 watches Bleach' exactly. But you can look on popular fanfiction websites like FanFiction.net or Archive of Our Own. There are likely many fanfictions that involve the Gotei 13 in some way while being related to Bleach.
This scenario in the fanfiction might lead to new alliances or rivalries. For instance, if Ichigo impresses certain members of the Gotei 13 during the fight, they could form an alliance later. Or, if Ulquiorra manages to outwit Ichigo while being watched, some in the Gotei 13 might see him as a more dangerous foe than they thought and target him more aggressively. Also, it could affect how Ichigo is perceived in the overall story. If he wins with great skill in front of the Gotei 13, his reputation could soar, and he could be more involved in Soul Society affairs.
The original destroyed works usually presented complex context and theme. The story often contained many different characters and plots. Each character had their own motives and goals. The theme of the story was also very rich, including love, friendship, power, betrayal, faith, and so on. The original destroyed works often used a large number of rhetorical devices such as metaphor, personification, symbolism, etc. to enhance their literary and expressive power.
The context of the text is usually more complicated, involving many different chapters and passages, each chapter and paragraph has its own theme and plot development. Destroyed works also often used jumping plots to make it difficult for readers to predict the future direction of the story. This plot design increased the fun and challenge of reading.
The original destroyed works also had a variety of topics, but generally speaking, the topics were about human nature and morality, including the weakness of human nature, the struggle of morality, inner contradictions, and so on. The original destroyed works also often explored human beliefs, culture, and history, and through these elements, they delved into the complexity and variety of human nature.
Since I don't know the exact 'original 20xx story', it could have various themes. It might be a theme of technological advancement if it's set in a future - like 20xx scenario.