tell me what Marion did to make the SSOL team "go". He's not underrated, at all. When his name is mentioned people do remember his versatility. What isn't remembered are his weaknesses as a creator, and how he "led" defenses that were middling at best. He didn't direct the strengths of the Phoenix suns team. That was Nash. Marion was a cog in the machine. Nash made the machine work. Draymond on the Warriors pre KD is far more influential than Marion ever was for any team in his entire career. Marion may be a prototype, but he didn't perfect the style.
Marion wasn't on the team in 2010 when the Suns had the best offense in the league and made the conference finals only to lose the eventual champion Lakers. They swept the Spurs that year. The next season the Suns did miss the playoffs. But what happened when Nash was on the floor? Suns had a 114 ortg in over 2400 minutes (best offense in the league was at 111 ortg), without MDA, with a much slower pace, and with Nash at 36 years old losing a lot of his off the bounce pop. He led a lineup of Robin Lopez, 38 y/o Grant Hill, 34 y/o Vince Carter and Channing Frye to a 111 ortg. Only one star in that lineup. Elite offense. Impact is still relevant even after a decline, after pieces around him left, unlike Shawn Marion.
So what you're saying is the Suns were really hurt by not having a reliable primary ball handler. You never stopped to ask why Shawn Marion couldn't assume that role? You don't think it's a flaw for a supposed franchise player to not be able to have offense run through them and the team to fall apart with no lead ball handler because he's not a good passer or isolation scorer? That's why he's overrated. You don't factor in how his below average handles and having zero jumpshot versatility made him a limited player.
Age and health concerns were reasons that Dallas let Nash walk. In 2004 he battled a bad back after spending much of his early years struggling with injuries, and the Mavericks moved Dirk to center instead of pairing him with a defensive center causing their defense to tank. They had Antawn Jamison and Antoine Walker as forwards alongside Dirk. The following year they lost both those sieves, moved Dirk back to PF, paired him with defensive centers. The Mavericks were still "only" 44-22 with Don Nelson (worse win percentage than in 2004, with Nash), then they changed coaches and were 16-2 to end the year. under Avery Johnson. Then they faced Nash''s new team in the postseason and he cooked them
In 2003 the Mavericks had a top ten defense, best offense in the league, went to the WCF and lost DIrk after three games. They won game five on the road in SA without DIrk. And you think that team couldn't reach the finals and win a title? Nash/Dirk powered some of the best offenses of the era, together, They were a great fit. The issues were more so related to health and unfortunate circumstances.
You very clearly don't understand how to evaluate basketball on a impact level. You don't see what Nash did for his respectives teams offense, with a WIDE RANGE of teammates around him that didn't change the result of elite offense with him as a common denominator. You look at championships and Finals appearances as a measure of player value. You don't use context when making sweeping claims against players you don't understand the value of. You are fiercely defending a guy that no one builds a team around (Marion) while trashing another guy who was the focal point of one of the greatest offensive teams in the history of basketball.