Of the 50 highest usage rate seasons in NBA history, only three have resulted in trips to the NBA Finals. Outside of A.I., Michael Jordan won the 92-93 Championship with a usage rate that ranks 35th in NBA history, and again with a championship in 97-98 that ranks 50th in usage rate history. Outside of that, the next highest usage rate season resulting in a trip to the finals by someone not named Michael Jordan is by 1996-97 Karl Malone coming in at 86th place.
And if your argument is, well, this is the era of super teams, and that means usage rates are lower for championship teams because there are so many great individual players on the floor.
Well, that explanation would be incorrect. The 2006-07 Cleveland Cavaliers team LeBron wheeled to the finals is considered by many to be the worst roster to ever play in an NBA Finals. LeBron James was by far the best player, to the point where he was the only All-Star player on the team. So you would assume his usage rate was through the roof, but that was not the case.
His individual usage rate for that season comes in at #187 in NBA History . . .