PROMISE NUMBER 2
"I Will Kill Orochi"
Result
NOTHING HAPPENED
Luffy also said in Zou that he'd beat up Jack. In the end he never even saw his face
Besides after saying this, Hiyori told him to leave Orochi to her, with Oda simply leaving that plot to her, and as many stated killing Orochi was never important with Kaido around
PROMISE NUMBER 3
"I Will Cut Kaido to Pieces"
Result
NOTHING HAPPENED
As I told to Zoro fans like
@HA001 before, people misinterpretated that scene. Cutting Kaido there wasn't meant to say he'd kill Kaido. He did accomplish his goal to cut up Kaido, even left him a scar, but the goal of defeating Kaido was always Luffy's job.
Luffy vs Kaido is something Oda was wondering about since more than 10years now, wondering how Luffy could beat him.
Zoro was never meant to be the one to finish Kaido. It was always totally contradictory with Oda's story writing for decades of One Piece, but if we look at the Wano writing as a whole, in terms of powerscaling, what Zoro did totally surpassed the usual expectations
Usually Zoro only fight the second of the arc, leaving the task to Luffy. In this arc, Zoro actually fought the main villain alongside Luffy, scarred him to life, temporarily blocked a "big move"(Hakai) from 2 yonko, showing crazy endurance, got an adcoc power up and mid diffing a YC1 after a temporarily healing medicine
The disappointment only comes from the fact of expecting more than necessary