The final 7 game series with the Lakers in 2010 and with Miami in 2012 share some eerie similarities:
After 4 games both series were tied at 2 apiece. The Celts won the 5th games to go up 3-2, then got blown out in the 6th games to even the series at 3-3. In both 7th games the Celts break out on top, grab big leads, lose the momentum in the 3rd quarter, and lose the game in the 4th quarter.
In both series the cause of defeat is "fatigue". In the 2010 final Pierce plays 46 minutes, KG 38, Wallace 36, Allen 45, Rondo 45.
In 2012 Pierce plays 42, Kg 35, Bass 40, Allen 39, Rondo 44.
During the playoffs each year we get important contributions from our reserves, but game 7 belongs to our starters. We choose to live or die with their heroics. They are up to the task mentally and aggressively, and fight the good fight to the finish. But, they are doomed because they cannot match the stamina of the other side's younger guys playing similar minutes.
However, though defeat is bitter, we have our heroes to love and admire, and hope they can return for an encore next year.