This is how I view Strong World: Oda wanted to establish Shiki canon, and then use Strong World as a movie to explore other later concepts, like SMILES. Strong World had a strong that affected animals in negative ways, and also destroyed the local populace: this is clearly a SMILE prototype concept, IMO.
So, Shiki DOES has a plan still going on, but it's not the one from Strong World: it's a plan revolving around his original goal, that he wanted to do with Roger, the Ancient Weapons. Edd War IS canon:
Shiki wants the Ancient Weapon that can destroy the world.
Loki wants to bring the world to an end.
Vegapunk stated the Ancient Weapons can destroy the world.
What Ancient Weapon did we just learn the location of, a location that currently has a Cover Series? A location, deep underground, that two Yonkou just got shot down into?
Shiki's goal in Strong World was some random anime movie BS.
Shiki's goal in Elbaph... is learning about the Ancient Weapons. Imu has Uranus, Fish-Man Island has Poseidon.
Wano is how close to Elbaph?
We're gonna get Cross Guild vs Shiki + Loki vs Blackbeard vs Wano + Straw Hats + who knows who else for Pluton
FUCK YEAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
WANO ACT 4 IS REALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL