The intense spotlight that has been trained on one world-class Liverpool great turned to another on Anfield's latest frustrating night.
Mohamed Salah has faced examination for his subpar performances this season - and was relegated to the bench for the second successive Premier League game as the Black Cats visited on Wednesday.
But it was captain Virgil van Dijk, a unmatched defensive foundation as Liverpool have swept up the full collection of major prizes, whose poor form took center stage during the draw.
Van Dijk, 34, and Salah, 33, both inked high-value two-year deals in the summer, with not one Liverpool concern voiced at the prospect of handing contracts to a veteran duo much closer to the end of their careers than the start.
Indeed, it was a cause of celebration - but now there is no escaping the brutal reality that levels have fallen worryingly for both.
Liverpool have been exposed in defence ever since manager Arne Slot and the club's transfer committee embarked on a £450m summer rebuild that has yet to prove anything like its worth.
At the same time, Van Dijk has started to forfeit the sense of being untouchable he has possessed since his £75m move from Southampton in January 2018.
Van Dijk has faced additional challenges by defensive partner Ibrahima Konate's loss of form, along with Milos Kerkez not finding his feet at left-back. But the great Dutchman has also had significant difficulties, as highlighted by his panic-stricken handball that gave away a penalty in the significant Champions League loss to PSV Eindhoven at Anfield.
It was exemplified in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a well-earned lead, Van Dijk giving the ball away before backing away and turning his back on a 25-yard shot that hit him and looped out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an curious trait of turning his back on the ball, sometimes to Liverpool's disadvantage.
Ill fortune at the end, yes, but it was a situation Van Dijk invited with his uncharacteristic failure to make a decisive move, Sunderland's Talbi seizing the moment.
"Van Dijk surrenders possession and then he just drops off. It's the wrong decision. 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 slipping up and doubting himself."
As with Salah, a player of Van Dijk's pedigree must not be dismissed after winning two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a stellar Liverpool career.
He has, though, looked a pale imitation of his usual dominant persona this season, with the worst recoveries 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 packed with experience, it was missing here. No-one was inspiring a team that once again looked lost to seize the initiative by the throat.
Van Dijk's subpar showing, which ended with him being used as the last resort of acting as an makeshift forward, was indicative of a deeply underwhelming Liverpool performance - which made Sunday's win at West Ham seem like the exception rather than the norm.
Slot stayed with the side that ended a run of nine losses in 12 games at London Stadium, Salah once more starting on the sidelines.
The Egyptian was introduced at the start of the second half as the Kop looked to him for inspiration. It failed to materialize, with £125m Alexander Isak also anonymous after getting off the mark 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.
A late scare came - but at the other end. Liverpool were only saved from humiliation in stoppage time when Federico Chiesa's superb tracking back allowed him to turn Sunderland substitute Wilson Isidor's shot off the line after he had dribbled past keeper Alisson.
Slot and his fading champions ultimately had to settle for a draw knowing it could have been worse, with Alisson fortunate 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 slow, ponderous and devoid of creativity. Even the traditional late rally after the equaliser carried scant belief. Showings like this are the reason their title defence has fallen apart.
But huge credit for the Reds' struggles on Wednesday must be given to Sunderland, who are being rewarded for a summer of serious ambition in the transfer market, coupled with the excellent coaching of Regis le Bris.
The Black Cats were positive, self-believing and threatening.
Sunderland are now sixth in the Premier League with 23 points. It is symptomatic of the manner in which they have embraced 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 a case of going back to basics.
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