As per the recent news https://today.usc.edu/earths-inner-core-is-less-solid-than-previously-thought/ the Inner Core was widely thought of as a solid sphere. The original aim of the University of South Carolina scientists was to further chart the slowing of the Inner Core. However, what they came across was to find evidences that the Inner Core is not solid. The physical activity is best explained as temporal changes in the shape of the Inner Core take place. The new study indicates that the near surface of the Inner Core may undergo viscous deformation, changing its shape and shifting at the Inner Core’s shallow boundary.

Back in 2009, I explained in my book on amazon More Than 60 Minutes- When Earth Stand Still that the source of the strong magnetic field that emanates from Antarctica to circumvent the planet and to immerse in the Arctic Circle is coming from the Inner Core, which at that time I introduced as a permanent dipole magnet, whose poles are in constant move thanks to its ductile property https://planet-earth-2017.com/the-true-source-of-earth-magnetic-field/ . Not only is the Magnetic Field source evidenced to be coming from a different source; contrary to what science books are telling and away from the induced magnetic field created by the Coriolis Effect, but also that such a magnetic field interacts with the Core flowing electron currents to from Lorentz force, which applies on the Inner Mantle to drive the planet to spin about its axis, and that the spin speed is highly dependent on the gap angle between the Magnetic force lines and the Electron’ currents force. At right gap angle of the two forces one gets maximum Lorentz Force and therefore maximum spin and at 0 gap angle Earth does not spin while still orbiting around the Sun. https://planet-earth-2017.com/what-makes-earth-spin/

Back in 2015 a research by the University of Illinois and colleagues at Nanjing University in China https://news.illinois.edu/earths-surprise-inside-geologists-unlock-mysteries-of-the-planets-inner-core/#:~:text=Thanks%20to%20a%20novel%20application,reveal%20information%20about%20our%20planet   further assured my earlier deduction as they provided evidences that the Inner Core is formed of two layers. While the crystals of the inner layer is structured sideway, the crystals of the outer layer are organized in a vertical way. Given the radioactive nature of the inner layer of the inner core (ILIC) the crystals are structured side way or for better way at right angle to axis of rotation. I manifested on https://planet-earth-2017.com/2017/05/18/another-proof-that-the-magnetic-configuration-of-earth-has-induced-and-permanent-fields/ that the interaction of such electrons flowing in the outer layer of the Inner Core (OLIC) before reaching the liquid Outer Core will cause no force to make the Inner Core spin about its axis unless there is a magnetic field in OLIC that act in tandem with the flowing electrons to generate Lorentz Force at each mass of OLIC body. A slight movement of the poles of such OLIC bipolar magnet whose surface is now proven to be ductile as evidenced at both northern and southern geographies controls the following:  

1. The strength of the Lorentz Force that applies on OLIC and therefore the spin speed of the Inner Core
2. The strength of the Lorentz Force that applies on the Inner Mantle and therefore the spin speed of the Mantle Layers, Crust and accordingly the whole planet.
3. Assuming that the same number of electrons that pass through OLIC are exactly equal to the number passing through the Inner Mantle; and since the same dipole magnetic field interacts with those electrons while passing through the Inner Core and Inner Mantle, then the difference between the speed of the Inner Core and the Planet is function of the difference between the masses of the a) Inner Core and b) Inner Mantle-Outer Mantle-Crust combined vis a vis the applied Lorentz Force.