The intense spotlight that has centered around one global Liverpool great shifted to another on Anfield's most recent frustrating night.
Mohamed Salah has been under scrutiny for his subpar performances this campaign - and was consigned to the substitutes' bench for the second straight Premier League game as the Black Cats came to town on Wednesday.
But it was skipper Virgil van Dijk, a exceptional defensive bedrock as Liverpool have swept up the full collection of top honors, whose struggles became the focus during the draw.
Van Dijk, 34, and Salah, 33, both agreed to lucrative new two-year deals in the summer, with barely a Liverpool concern voiced at the prospect of offering extensions to a experienced stars much approaching the end of their careers than the start.
Indeed, it was a cause of celebration - but now there is no denying the harsh truth that performance has dipped worryingly for both.
Liverpool have been exposed in defence ever since head coach Arne Slot and the club's recruitment team began a £450m summer refit that has still to demonstrate anything like its worth.
Concurrently, Van Dijk has started to lose the sense of being untouchable he has held 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 struggling to adapt at left-back. But the great Dutchman has also had significant difficulties, as demonstrated by his desperate handball that resulted in 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 merited lead, Van Dijk losing possession before backing away and turning his back on a 25-yard shot that struck him and looped out of the reach of goalkeeper Alisson.
For a defender of such unquestionable quality, Van Dijk has an curious trait of shying away on the ball, sometimes to Liverpool's cost.
Misfortune at the finale, yes, but it was a situation Van Dijk invited with his uncharacteristic failure to make a decisive move, Sunderland's Talbi capitalising.
"Van Dijk gives the ball away 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 was impeccable. Every game he was commanding, but right now he's making mistakes and doubting himself."
As with Salah, a player of Van Dijk's caliber must not be discarded after claiming two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a stellar Liverpool career.
He has, though, looked a faded version of his usual imperious self this season, with the poest ball recovery rate per game during his Liverpool career, while key defensive stats are also down on last season.
And, while leadership should not be Van Dijk's preserve alone in a Liverpool team full of experience, it was lacking here. No-one was rousing a team that once again looked lost to take control by the scruff of the neck.
Van Dijk's subpar showing, which ended with him being used as the last resort of acting as an emergency striker, was representative of a distinctly poor Liverpool performance - which made Sunday's win at West Ham seem like the anomaly rather than the standard.
Slot kept faith with the side that ended a run of nine losses in 12 games at London Stadium, Salah once more observing from the sidelines.
The Egyptian emerged at the start of the second half as the Kop pinned hopes on him for inspiration. It failed to materialize, with £125m Alexander Isak also quiet 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 been turned in off Nordi Mukiele to set up what Liverpool hoped would be a thrilling finale.
Late drama 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 rounded keeper Alisson.
Slot and his underperforming defending champions ultimately had to settle for a draw knowing it could have been worse, with Alisson lucky 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 lacking in ideas. Even the customary late surge after the equaliser carried scant belief. Displays like this are the reason their defense of their crown 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 proactive, self-believing and dangerous.
Sunderland are now sixth in the Premier League with 23 points. It is telling of the manner in which they have grown into 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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