According to reports, the move marked the climax in a power-struggle between Javid and Boris Johnson's chief advisor Dominic Cummings, with the Chancellor reportedly nicknamed "CHINO" - "Chancellor in name only" by Cummings and his allies.
But the finance minister's resignation - which some commentators said might have been sought by Johnson's team - because of a dispute over Javid's advisers added to the picture that the prime minister will not tolerate dissent in his government.
"So this is either going to be a meeting of minds or Sunak will be the Prime Minister's 'yes man" living in Number 11, ' he said.
Andrea Leadsom and Esther McVey are among others no longer in government.
This comes after Pakistani-origin Sajid Javid resigned as Chancellor in a shock move, in one of the biggest shakeups since Johnson won a thumping majority in the December 2019 general election.
The bombshell - less than a month before the Budget - follows tensions between Mr Javid and Mr Johnson's senior adviser Dominic Cummings.
In his resignation letter, Mr Javid said: "I believe it is important as leaders to have trusted teams that reflect the character and integrity that you would wish to be associated with".
Javid's resignation was a surprise moment during Thursday's reshuffle and came after he refused to cave to demands from Downing Street to sack his entire team of aides.
Planning for that has got off to a rocky start, with Johnson last week firing Claire O'Neill, a former British government minister appointed previous year to head up the event.
But yesterday shows that No 10's priority was political control rather than keeping personnel they valued.
Mel Stride, chairman of the Commons Treasury Committee, said Mr Javid had little choice but to leave the Cabinet.
More on the reshuffle that saw Sajid Javid resign as chancellor on Thursday.
Johnson quickly replaced him with Rishi Sunak, who had previously been a deputy to Javid at the Treasury and is widely regarded as a dependable loyalist to the prime minister.
Julian Smith was also sacked as Northern Ireland Secretary - weeks after he brokered the deal that restored the power-sharing administration in Stormont.
The former Treasury minister told BBC Radio 4's Today programme: 'I think he, probably more by accident than design, was put into a position where it was extremely hard for him to swallow that and move on'.