the reason other colours are added is to reward you for your progress. When you are at one colour for 4 years, it can seem like you're not moving forward
A colour in between can show that that progress and avoid that frustration
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Joe Rogan: "If you put Phil Baroni's brain in Pedro Rizzo's body, he would not lose."
Mike Goldberg: "and he would speak better english too"
--- UFC 45 - Rizzo vs Rodriguez match ---
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