Why did senior Congress leaders, 'Syndicates' support Indira Gandhi initially?

In the hope that she would depend on their guidance

Navigating through initial challenges, the new Prime Minister experienced a period of adjustment. Despite Indira Gandhi's prolonged engagement in politics, her tenure as a minister under Lal Bahadur Shastri was brief. It's possible that senior Congress leaders lent their support to Indira Gandhi with the expectation that her limited administrative and political experience would compel her to rely on their support and guidance.

Within a year of assuming the role of Prime Minister, Indira Gandhi found herself at the helm of the party during a Lok Sabha election. Concurrently, the economic situation in the nation had deteriorated further, contributing to the complexity of her circumstances. In response to these formidable challenges, she embarked on a mission to secure command over the party and showcase her adeptness in leadership.