So it took Saul two years to build the school and the library? That's rather fast, guess it's true that Elbaf giants are no longer battle-hungry savages (even Saul himself had that prejudice). Can't help but wonder what's causing the books to go big, the owl's DF maybe?
Lilith did say she will explain it later but I guess she was on the rush for her self-introduction and say what will be her next plans for awhile. With how big egghead is, the vegapunks will need a place on the ground to go back so they can get the supplies they need to rebuild and also a place to act as a connection to outside world as sky islands tend to get very isolated like Skypiea.
The Marines saw the books in ch 398... And didn't do shit.
And cloning stella is a middle finger to stakes. At least Vegapunk's main body is- WRONG get fucked if you wanted stakes. I hate most fakeout deaths especially like pell or kinemon.