Guys, colour rules change with each clan. In kotor II Mandalore the Preserver was the only mando with silver armour, the highest ranking ones had red or yellow. Revanites, Ceta Farr s mandos mainly had blue armour but im sure i saw a slight armour change marking rank. Kotor I most of the mandos were colour ranked. It changes with each clan, just as each clan has their own traditions and customs. So on so on.