KG is an outstanding and unique talent. Without him, we do not get banner 17. There is not a player in the league who defends better, and inspires other people to defend better the way KG does. Pierce may be a more gifted scorer, but KG has the skills of a guard and a center, and with his incredibly length and intensity he shapes our team and shapes our games. He is irreplaceable, especially because he is willing to defer to Paul Pierce, give him the credit, and allow Pierce to be the Captain with such grace.
KG wasn't telling "the truth" as you suggested it. he was commending Pierce for his stellar game, not saying "Paul Pierce is better than I am, and contributes more to the team than me, and I bow before him".
I love Pierce, he's my favorite player, but KG will go down in history and in bars across America,he will be mentioned in far more select company than Pierce ever will be.