It seems as though you reward Lebron and Miami for not being as good a team and then having magnificent performances against weaker competition.
The 2001 Lakers were the greatest playoff team in history. They swept 50–32 Portland (Pippen-Wallace), 55–27 Sacramento (Webber-Divac-J Will) and 58–24 San Antonio (Duncan-Robinson), then beat the best team in the east, 56–26 Philadelphia (Iverson-Dikembo) 4–1. Their opponents featured eight Hall of Famers, with a combined winning percentage of 66.7% Their point differential throughout the playoffs was 12.8, the greatest in modern history.
The 2012 Heat had a much easier path to the championship. The best team in the East lost in the first round because Derek Rose got hurt. The Knicks lost two both of their starting guards to injury in losing 4–1 to Miami. The Pacers lost two of their best players to injury in game 5 with the series tied 2–2, and lost 4–2. And the Celtics old guys finally hit their expiration date, but still held a 3–2 lead. In the finals, they played a green Thunder team that was emotionally exhausted after coming back from down 2–0 against San Antonio.
Combined winning percentage of Miami opponents: 59.8% and a point differential of 7.0.
Even though every player’s career is not yet over, it appears that Miami played only two elite teams featuring five Hall of Fame players (six if you count Melo on a weak Knicks team).
The Lakers played against much tougher competition and completely dominated everyone — Shaq wins as alpha dog.
Even if you give a Legacy-Check edge to the Heat this one metric should not be given equal weight compared to historic measures like how many titles each team could have won.
Shaq and Kobe definitely could have won five or six rings. They suffered key injuries (Kobe, Horry) as they tried to win their fourth straight, and again in 2004 (Malone). In 2005 and 2006, Kobe was at his absolute peak, while Shaq rebounded to lead Miami to the conference finals and an NBA championship.
Finally, look at each team’s record in NBA finals. The Lakers were 3–1 in Finals, with an 13–7 won-loss record.
Miami was 2–2 in Finals, with an 11–12 won-loss record.
Based on all these metrics, it’s not even close — Shaq and Kobe were by far the GOAT. And for that one magical playoff run in 2001, they compare favorably to any team in history.