Einstein's black hole did spin and was massive, as the result of the Fermionic Supernova implosion compression.
However he did not accept that Fermions could be based on compounded Transformable Strings of different masses, which even can transform by Supernova pressure into massless photonic string knots called Black Holes.
Secondly the Q_FFF model says: the Big Bang evaporated not only reduced chucks of Black Holes but also single strings as the base for the dark energy based oscillating Axion string vacuum, being the main origin of the Black Hole pressure gravity from Axion collisions outside the vacuum.
Even normal Fermionic matter feels the vacuum pressure from outside, however the Fermions inside normal matter seem to produce weak graviton photons being transformed out of the vacuum (Axion Higgs field) strings.
see: What is Wrong with Current Physics to Explain Ball Lightning
MASS IS THE ABILITY OF SPINNING FERMIONS TO COLLIDE WITH -AND TRANSFORM VACUUM PARTICLES INTO LESS EFFECTIVE GRAVITONS ( and other "eigen energy") = less PRESSURE than the vacuum. Conclusion all Gravity is the result of combined opposing colliding string pressure differences. created by Gravitons and Axions.
Black Hole gravity is based on only vacuum string pressure, they absorb even all vacuum pressure strings into the singularity nucleus string knot..
ALSO see: Grand Unification of 4 Forces according to the Quantum FFF Model by Di-Monopole Repeller Rigid String Pressure.
See also: The Conscious Theory of Everything, by the Combined Penrose-Libet-Cramer-Q-FFF Theory.
The New Physics of the combined Penrose- Libet-Cramer-Q-FFF Model, is opposing the standard model of physics, because it proposes the creation of Massive Entangled (Cramers Transactional) Fermion Pairs out of the Oscillating Virtual String Vacuum Collider Black Hole Horizon( Q-FFF model) by the "Penrose Trapped Space Horizon" around all Black Holes, which is by the Q-FFF model interpreted as "Virtual Axion String Space Collider Horizon producing real Fermions", even around Ball Lightning Micro Black Holes. However we need a 12 fold (anti) Copy Multiverse to be able to use the Benjamin Libet process of two different "Readiness Potenrials" ( RpI and RpII) for a democratic system of Free Won't in the John Cramer's instant transactional Multivers.