Golden State Warriors legend Rick Barry says he APPROVES the team retiring Kevin Durant's #35 jersey ... he's just got one issue with KD -- why did you leave for Brooklyn?!
Barry -- one of only 6 Warriors players to ever have their number officially retired -- thinks the world of Durant ... saying he's an obvious Hall of Famer and one of the most special players of all time.
But Barry is very confused as to why Durant would leave such an amazing situation in Golden State for an unsure future with the Brooklyn Nets.