I think the general analysis here is correct, but I do think liam's got a point on the age thing - the guy is only 24, for context, that's Harden's second season in Houston, or Iverson's fourth season with Philly. Not either player's peak. James won his first MVP at 24, but he'd also been in the league since 18 and is by far the best player who's come up in this conversation save Bird.
And, while I don't think it's particularly fair to compare Luka with Bird, since it was mentioned: Bird was winning titles at 24/the 1980 season.