Winning his directors' approval was almost insignificant in contrast to the task which now lay ahead of the Dodger president. He made certain that word of his plans did not leak out, particularly to the press. Next, he had to find the ideal player for his project, which came to be called "Rickey's noble experiment." This player had to be one who could take abuse, name-calling, rejection by fans and sportswriters and by fellow players not only on opposing teams but on his own. He had to be able to stand up in the face of merciless persecution and not retaliate. —I Never Had it Made,
Jackie Robinson, as told to Alfred Duckett

What does the word insignificant mean in the context of this paragraph?

meaningless
tricky
difficult
impossible