Nah Imu definitely knew something and even if we assume he didn’t Luffy is still a D. whats the point keeping him alive and let him grow more.
Oda will try to pull an Aizen here but he will fail as usual.
- Him breaking into Impel down
- Him interfering with Marineford
- Shanks coming to his Aid in marineford
- Taking down 3 Warlords
- Connection with Dragon and Garp
- Connection with Roger Pirates (Ray , Shanks , Buggy)
- A fuckin rubber fruit which doesn't even exist (I mean how difficult was it to look up decil fruit encyclopedia)
- Conqueror's in Marineford
- Waging war with WG in Eniess Lobby
- Punching a Celestial Dragon

If this doesn't scream Nika I don't know what does.