Ex-NBA star Shawn Marion says the LAST thing players should do is sit out the 2020 season ... saying sitting out will diminish their chances at making a bigger difference in the fight against racism.
Superstars like Kyrie Irving have expressed their uncertainty over restarting the season in the middle of the Black Lives Matter movement ... with the Nets star saying players' focus should be on fighting for social justice.
Ex-NBAer Stephen Jackson -- who was friends with George Floyd -- sided with Kyrie .