There are many, many, many things wrong with that chart and it pretty much explains nothing.
In 2005-2006, Kobe Bryant was the best player in the NBA, it's true. He averaged 35.4 ppg (only Elgin, Wilt, Jordan and Rick Barry have ever done that) and people always talk about Kobe being a senseless chucker, but he shot a respectable 45% from the field. In addition, he probably should have shot more, because his team was fucking terrible. The next five guys behind Kobe in minutes played on that team where Lamar Odom, Smush Parker, Kwame Brown, Devean George and Chris Mihm. Despite all that, Kobe dragged that team to 45 wins and the 7th seed in a brutal Western Conference and nearly upset the Suns in the first round. VORP might come out saying one thing, but if you replaced Kobe on that team with a league average player, say Ricky Davis, that team wouldn't even win 15 games.
Karl Malone can lead the league in VORP all he wants, until it comes down to the last two minutes and his face looks like he just bit into a lemon. If the idea is who held the Championship belt, then actual championships should matter. David Robinson might hold the edge during the MJ-less years, but anybody that doesn't think that Hakeem was the best player during that two year span needs their head examined. All the proof is in the 1995 playoffs, where Hakeem bulldozed his way through Robinson in spectacular fashion, knocking out Robinson in the title fight like he was Sonny Liston.
Bill Walton was the best player in 1976-77, even if his reign only lasted one year.