The appointment of former Reserve Bank of India Governor Shaktikanta Das as Principal Secretary - 2 in the Prime Minister’s Office on Saturday underscores Prime Minister Narendra Modi’s intent to strengthen his core team’s ability to navigate the country's economic challenges.It also signals a change of guard at the government’s most powerful arm of decision-making, with insiders suggesting Das may eventually take over from Pramod Kumar Mishra, who has been one of Modi’s most trusted aides for decades and his principal secretary since September 2019.