We were told the Holy Land was on fire by Imu in 1149.
Either Oda forgot to draw this that one chapter, or the section on fireIt's far away from the main castle. Point being the holy land is on fire.
So here's what I think Teach is cooking
1. Through the Yami, or Devon turning into Saturn, the blackbeard pirates learn how to use the abyss to travel, and make a pact with Teach to make seals.
2. First stop Impel Down. Get King, Queen, Doflamingo, other pirates. The first time teach came, he only had the yami. Now Teach has the Gura. Teach sinks Impel Down.
3. Quick abyss trip to the holy land. King sets everything on fire. Laffitte has been preparing for this invasion since 1226, two days before Elbaph. Teach gets York, Giant Straw Hat, and Xebec's Saber from the flower room. Also takes celestial dragon hostages, since negotiations with colby cheese as hostage failed.
4. Next Egghead. York takes over island. Devon turns into Saturn and commands Seraphim. Teach rules Egghead, York joins.
5. Cross Guild Alliance after Garp is sold to CG for 3 Billion.
6. Cross Guild invades Wano for Pluton. Blackbeard invades FMI for Poseidon.
Loki + Blackbeard + Cross Guild is what we need to regain the hype. WG will then invade Wano for Pluton, and we've got ourselves a fuckin battle royale.