I believed in Caribou, and, somehow, by golly, it paid off. I still can't believe this is how it happened, but, I'm estatic.
This sets up Blackbeard as a power threat, and finally put Pluton in direct plot relevance, rather than just some possible prize.
Keep in mind that Caribou is a Super Rookie/Supernova who is well know for viciously killing Marines. The Blackbeard Pirates will at least want to hear him out, Caribou is far from weak, they'll know who he is and be interested.
Now we just need a Kuma teleport back to Wano to start Act 4 (keep in mind his bubbles take a while to reach their destination, meaning the Straw Hats could get to Wano after the Blackbeard Pirates invade for Pluton).
First, though, we have to see what the Seraphim are up to...
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(so shaketh the Magic 8 Ball)
"It is certain"