Sub-Plot 01 ---> Egghead Situation
Sub-Plot 02 ---> Red Line Situation (Kuma)
Sub-Plot 03 ---> Blackbeard Situation
Sub-Plot 04 ---> Elbaf Situation (Kid)
Sub-Plot 05 ---> Sphinx Island Situation
There is a reason why Oda is showing too much simultaneously, it's cuz the Endings of all these Plots are "Connected"
How? Because each Plot will end with a Major Character Introduction
Sub-Plot 01 ---> Lurking Villain (Waiting for someone to Leave Egghead)
Sub-Plot 02 ---> Imu-Sama
Sub-Plot 03 ---> ??? (Possibly Blackbeard's True Identity/Secret)
Sub-Plot 04 ---> Burning Scar Man
Sub-Plot 05 ---> ??? (Possibly Bakkin's True Allegiance & Goals)
... etc
In other words, just like Jaya Arc ended by showing that Burgess, Doc Q, Van Auger, Laffitte & Pie Guy are actually Blackbeard Pirates
Or when Thriller Bark introduced "Mysterious Four" Simultaneously after only teasing them;
Egghead Arc is gonna end with a Mega Introduction of Multiple Villains who work together in secret & are actually Story's Final Villains
(It doesn't mean they will go down together or last, but they are the ones responsible for lot of things behind the curtains)
Personally i believe we are gonna get Introduction of:
Luffy meeting Lurking Legend (From Elbaf)
Kuma meeting Imu-Sama
Kid meeting Rocks D. Xebec and/or Vander Decken
Blackbeard or Garp meeting Willie Gallon
And Bakkin/Weevil True Identity also revealed to someone
... etc