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if the home team picks to wear the road jersey the away team would have to wear the home jersey
I think that's how it works in the NFL for sure. But not NBA.
They just have to wear a contrasting color, not necessarily their home or away jersey:
"Coinciding with the introduction of the new uniforms, the NBA is eliminating its "Home" and "Road" uniform designations. Beginning with the 2017-18 season, home teams will pick which of their uniforms will be worn at all home games and visiting teams will choose a contrasting uniform within their own assortment."
But that still doesn't answer why the lakers rarely wore purple.