Importance of the goalkeeper in the development of the game
The goalkeeper is the most delayed player and one of those who has the most responsibility. This has as main function, to intercept protecting his goal, preventing the rival from scoring a goal.
No part or phase of the game is more important than another. They are all equally relevant, but if I had to highlight one above the others, this would be the start of the game in the initiation zone, that is, the ball coming out from the goalkeeper.