The need for a complex transformable string particle, the Axion vacuum / black hole into all other particles. including compound quarks.
From transforming Photon strings to Fermion strings and Black hole string knots by mutual collision and compound interference see also: https://vixra.org/pdf/2101.0131v3.pdf
The Q-FFF Rigid String Theory says: (1) There is only one CONSTRUCTIVE Topological and Resilient TRANSFORMING STRING (Axion/vacuum Dark Energy building block ), forming direct after the Black Hole Splitting Big Bang. so called Travelling TADPOLE Black Hole based Filaments, expanding the Cosmic Lyman Alpha Structure. (2) A Raspberry Entangled 12x Mirror Copy Multiverse is Postulated as base for uncertainty (ER=EPR) and Libet's FREE VETO WILL . SO We live inside an exploded BH