a heads up for anyone agonizing over 431 and it’s distinct oddness compared to the rest of the manga/as a last chapter:
tl;dr horikoshi asserts that 429 is mha’s final chapter and 430 is mha’s epilogue. he subtly implies he did not write 431 and less subtly implies he does not see it as part of his main storyline. basically up to us if we want to see it as canon or not, but to horikoshi, chapter 430 was the end of bnha.