i get what you're saying, but you're overly complicating things.
point guard is not a role, it's a position.
playmaker is a role, sure. lead guard, lead ballhandler, creator, whatever. those are roles. point guard is a position. it's black and white.
steph curry is the best player in the league who plays the point guard position. period. there's no credible counterargument.
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it is a capital mistake to theorize before one has data. insensibly one begins to twist facts to suit theories, instead of theories to suit facts. - sherlock holmes