Flower, rightly lauded by new England and Wales Cricket Board managing director Paul Downton as the most successful coach in this country's cricketing history, took characteristic time to reflect on the 2013/14 Ashes embarrassment before deciding he could not stay on after all in his current role.
In doing so, however, he also marked the watershed event with some observations which may yet prescribe future policy.
The new incumbent - surely Ashley Giles - will, if Flower's parting shot is heeded, once again take hands-on responsibility not just for the Test team but those who play one-day internationals and Twenty20s too.
In that case, and assuming a reasonable length of time before England confirm the appointment, an experiment with split responsibility for coaches will last less than 18 months.
It was at the end of November 2012, in the glow of a famous Test victory in Mumbai, that it was announced Flower and the ECB had agreed his role as team director would incorporate direct responsibility for Test campaigns only - with Giles promoted to take charge for all limited-overs fixtures.
But that is the past, and a transitory one too it seems if Flower's most recent remarks are taken to their logical conclusion.
Flower's words were resonant for the medium-term future of an organisation he has represented with conviction and assurance over five largely fruitful years.
"In order for England cricket to make significant progress, I believe that the team director - together with the respective captains - needs to be responsible across all formats in order to positively influence the rebuilding process," he said, as part of an ECB statement.
Giles then can expect, if he has not received confirmation already, that his brief will once again be an all-encompassing and - as Flower himself discovered - exacting one.
The Giles era, if that is what comes, will nonetheless be a significant contrast to the regime which preceded it.
There is no suggestion that England's former Ashes-winning spinner is any less of a taskmaster than one-time world number one batsman Flower.
But all the indications are that Giles, five years his predecessor's junior, can apply a lighter touch.
It brought bewildered expressions all round when Flower insisted, in a press conference after England's fourth-Test defeat in Melbourne last month, that he sensed he must add an increased intensity to his methods.
The perception, from a distance and perhaps thanks in part to comparison with an Australian dressing room under the genial and increasingly successful stewardship of Darren Lehmann, was that the tourists were plenty intense enough already.
Granted, such qualms were never voiced while Flower and Andrew Strauss were winning back-to-back Ashes home and away - or even during last summer's victory over Australia or the one in India after Alastair Cook filled the captaincy side of the partnership.
But when cracks began to appear, in Kevin Pietersen's 2012 summer of discontent, Flower's man-management style had a more pressing relevance.
No one but the inner sanctum could know for sure if an update was necessary - and when Pietersen was 'reintegrated' to significant initial effect, the questions ebbed away again.
There is nothing like a 5-0 Ashes whitewash, though, to ensure old doubts resurface - especially when Flower, Cook and even batting coach Graham Gooch spoke publicly of more suffering likely still to come before any improvement.
Inside, it was clear all could not be well; outside, given the zealous guarding of team England's secrets, it was and is still merely guesswork as to what could be ailing.
In Australia this winter, the tourists came up very short against resurgent, determined and highly-skilled opponents.
England set out in October with an ageing nucleus of former world-beaters, and even those who have stayed the course will return - after their limited-overs blow-out under Giles - with nothing but trouble to show for hapless efforts.
Public opinion, less defining or merciless than in football but a dynamic force nonetheless, has demanded some changes must be made to management and playing personnel.
Flower, unsurprisingly, did not yield easily - at first, in the immediate aftermath of the whitewash in Sydney, professing an intention to carry on and underpin a revival.
In the end, he has perhaps not just done the decent thing but acted for all the right reasons too.
Cook may feel more able to be his own man, as he himself has stressed he must, alongside a new coach.
He and Giles will doubtless be interested to hear nonetheless that Flower may not be going that far away.
Downton and ECB chairman Giles Clarke have already cited discussions about a prospective new role - one which could yet ensure England's most successful coach continues to have a say on how his old ship is run.