The King's Indian Defense is characterized by the moves
1. d4 Nf6 2.c4 g6. (As opposed to
2...e6, with the intention of developing the Bishop to the Queen-side.) Black aims for a strong King-side offense with sharp tactical play. The Classical line:
[FEN ""] 1. d4 Nf6 2. c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5
Nimzowitsch and others of the hypermodern school popularized the Nimzo-Indian and Queen's Indian defenses early in the 20th Century. The King's Indian was known, but was seen far less frequently until David Bronstein started playing it in the 1940s and 50s.
So, to the question, what factors brought the King's Indian to prominence aside from Bronstein? What developments in theory advanced its use compared to the other Indian defenses?
(To clarify: I'm coming at this as someone who's unrated and no more than a casual player at best. I'm looking more here for the historical aspects and understanding of the times, though I won't turn down discussion of modern theory.
Additionally, I'm aware that this is subjective. I'm fairly confident it fits into "good-subjective", given the nature of Chess.SE. There hasn't been any major discussion on the KID here, and I'd like to see what the minds here have to say about it, given how important it is in modern play.)