I've also re-read Tonya McKay's article, which mentions that specific polyquat. For those interested: Low-Shampoo or Co-Wash Routines and Polyquats
F - LP - HD - NE
Fine, low porosity, high density, normal elasticity
Hairtype 2c

Low poo: Petal Fresh Organics Rosemary & Mint Volumizing Shampoo
Protein: Colorful Neutral Protein Filler
Detangler/RO: KCKT (winter) or Curl Junkie Beauticurls Argan & Olive Oil (summer)
Styling: KCCC

Beauty Is Not a Number