There are no other options.
Edit: Before anyone gets it wrong, this picture of Luffy shows that he is not a samurai.
Kaido getting taken down by a samurai similar to Oden is just one of the options Oda could have taken, but chose not to.
To put things into perspective:
- Luffy has been gunning for Kaido since Punk hazard, he and Kaido have developed a rivalry since Act 1, and there's also the case where both of them are joyboy candidates or more accurately, Luffy succeeded where Kaido failed in becoming Joyboy.
- Kidd was captured with his entire crew, and had his first mate fed a smile fruit, combine that with his supposed rivalry with Luffy, he also deserves to put Kaido down.
- The scabbards though weak, were prophesied by Toki to bring down Kaido and his tyranny on Wano.
- The arc has been building up on betrayal amoungst alliances, and there have been hints that Big Mom might backstab Kaido, she also has ground for killing Kaido.
All of the above is to show that Oda always has multiple people who have reasons for taking down the villian, but ultimately its Luffy who does it.