These chapters might get a lot of hate for being "reaction piece" but it's starting to grow on me. Seeing even the failed Baroque Works agents in Alabasta was pretty nostalgic, considering how much happened between that arc and now.
We get confirmation that Uranus destroyed Lulesa island and apparently it's fueled by Mother Flame.
The world building is getting interesting, One Piece being a post-apocalyptic world is not something new to theories, but having it confirmed is pretty rad. This strengthens Imu's chances of being final villain even more, too. He's confirmed to have an ancient weapon, is directly responsible for not only the oppression of the world for the last 800 years but also the genocide and destruction of the old world.
Egghead's not as good as a lot of us wanted it to be but I think on a full reread, it's shaping up to be much more palatable.