The unforgiving attention that has fallen upon one world-class Liverpool great shifted to another on Anfield's latest disappointing night.
Mohamed Salah has come under fire for his struggles this campaign - and was relegated to the sidelines for the consecutive Premier League game as the Black Cats arrived on Wednesday.
But it was leader Virgil van Dijk, a unmatched defensive bedrock as Liverpool have secured the complete set of major trophies, whose dip in performance took center stage during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both agreed to high-value two-year deals in the summer, with barely a Liverpool question asked at the idea of securing the futures to a veteran duo much approaching the end of their careers than the start.
In fact, it was a moment of optimism - but now there is no avoiding the harsh truth that standards have dropped worryingly for both.
Liverpool have been vulnerable in defence ever since head coach Arne Slot and the club's transfer committee began a £450m summer rebuild that has yet to prove anything like its worth.
Simultaneously, Van Dijk has started to lose the air of invincibility he has carried since his £75m transfer from Southampton in January 2018.
Van Dijk has faced additional challenges by center-back colleague Ibrahima Konate's dramatic dip, along with Milos Kerkez struggling to adapt at left-back. But the great Dutchman has also fought his own battles, as demonstrated by his desperate handball that gave away a penalty in the heavy Champions League loss to PSV Eindhoven at Anfield.
It was encapsulated in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a deserved lead, Van Dijk surrendering the ball before retreating and averting his body on a 25-yard shot that hit him and floated out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an curious trait of turning away on the ball, sometimes to Liverpool's disadvantage.
Ill fortune at the conclusion, yes, but it was a situation Van Dijk invited with his uncharacteristic failure to take charge, Sunderland's Talbi seizing the moment.
"Van Dijk loses the ball and then he just retreats. It's the incorrect choice. He needs to go to the ball. Him not making the decision means that no one else knows what to do."
"Virgil Van Dijk last season couldn't make a mistake. Every game he was commanding, but right now he's making mistakes and second-guessing himself."
As with Salah, a player of Van Dijk's pedigree must not be discarded after claiming two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a glittering Liverpool career.
He has, though, looked a pale imitation of his usual commanding presence this season, with the lowest recovery numbers per game during his Liverpool career, while tackles and interceptions are also down on last season.
And, while leadership should not be Van Dijk's sole responsibility alone in a Liverpool team full of experience, it was absent here. No-one was rousing a team that once again looked bewildered to take control by the scruff of the neck.
Van Dijk's poor display, which ended with him being used as the desperate measure of acting as an makeshift forward, was indicative of a horribly mediocre Liverpool performance - which made Sunday's win at West Ham seem like the outlier rather than the norm.
Slot kept faith with the side that ended a run of nine losses in 12 games at London Stadium, Salah once more watching from the sidelines.
The Egyptian was introduced at the start of the second half as the Kop looked to him for inspiration. It was not forthcoming, with £125m Alexander Isak also anonymous after opening his account with his first league goal for Liverpool on Sunday.
Slot would have been under greater pressure had Florian Wirtz's 81st-minute shot not deflected in off Nordi Mukiele to set up what Liverpool hoped would be a dramatic ending.
Late drama came - but at the other end. Liverpool were only spared embarrassment in stoppage time when Federico Chiesa's excellent defensive sprint allowed him to turn Sunderland substitute Wilson Isidor's shot off the line after he had beaten keeper Alisson.
Slot and his fading champions ultimately had to accept the point knowing it could have been worse, with Alisson blessed to turn Trai Hume's shot onto the bar in the first half before Omar Alderete headed against the post after the interval.
Liverpool were sluggish, labored and devoid of creativity. Even the typical final push after the equaliser carried little conviction. Displays like this are the reason their attempt to retain the title has crumbled.
But significant praise for the Reds' struggles on Wednesday must be given to Sunderland, who are being rewarded for a summer of notable ambition in the transfer market, coupled with the fine work of Regis le Bris.
The Black Cats were positive, self-believing and a genuine threat.
Sunderland are now sixth in the Premier League with 23 points. It is symptomatic of the manner in which they have adapted to life in the Premier League that they will be unhappy they left Anfield without adding two more to their tally.
For Slot and Liverpool, it is time for reflection.
Elena Voss is a seasoned gaming strategist with over a decade of experience in competitive gaming and betting analysis.