People just kind of assumed whatever Roger was laughing at was the thing, but just the history of the world and how everything connects really doesn't explain why Imu is so outright afraid of anyone getting to the last Island. There is something else there that is a direct, tangible threat to Imu personally.
I’m taking the approach I always have: it’s gotta do with Joy Boy, and how his antics meant that the World Government under Imu doesn’t have absolute power and there’s no way all resistance can be completely crushed, all because of the treasure Joy Boy left.
@ShitLurker sorry, but I gotta call bullshit on your Shanks theory. Something like cooperating with the World Government basically would fly in the face of everything built up and what we know about the guy so far.
For starters, he was on Roger’s crew, so he’s already on the WG’s enemies list for that alone. Also, Garp hates Shanks for making Luffy choose the path of a pirate, maybe he isn’t alone in thinking that.
Second, the Gorosei were concerned when they heard that Shanks and Whitebeard were meeting up, and then said that the balance of the world needed to be maintained, before seething over Luffy becoming a chaotic force.
Third, if Shanks had any form of WG cooperation or collusion agreement, there’s no fucking way he’d be so chill with Ace being Luffy’s brother, he wouldn’t step into Marineford to stop the fighting the way he did (let alone bury the bodies of Ace and Whitebeard), and he sure as hell wouldn’t be so friendly with Luffy to the point where Luffy sees Shanks as a role model, and he certainly wouldn’t give Luffy his hat.
Sure Shanks had his reasons for doing what he does, such as turning down the chance to see Luffy again when the opportunity presents itself, but to paint it as being some kind of evil the whole time is just moronic to the nth degree.
Most I can see is him taking on the task of searching for Roger’s successor as determined by fate by himself, or some kind of crusader to ensure the course of history goes the way Joy Boy and Nika feels it should considering he stole the Gomu Gomu no Mi, and then his attention turned to Luffy in a massive way once Luffy ate the damn thing to the point where Shanks then saw Luffy as more than just some kid with his head in the clouds.