The intense attention that has been trained on one elite Liverpool legend shifted to another on Anfield's most recent disappointing night.
Mohamed Salah has faced examination for his poor form this season - and was placed on the 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 unmatched defensive foundation as Liverpool have collected the complete set of major trophies, whose struggles came under the microscope during the stalemate.
Van Dijk, 34, and Salah, 33, both signed new lucrative two-year deals in the summer, with scarcely a Liverpool question asked at the prospect of handing contracts to a experienced stars much closer to the end of their careers than the start.
In fact, it was a cause of celebration - but now there is no denying the brutal reality that levels have fallen concerningly for both.
Liverpool have been exposed in defence ever since boss Arne Slot and the club's scouting department undertook a £450m summer rebuild that has not yet shown anything like its worth.
Simultaneously, Van Dijk has started to forfeit the aura of invulnerability he has carried since his £75m move from Southampton in January 2018.
Van Dijk has not been helped by center-back colleague Ibrahima Konate's loss of form, along with Milos Kerkez not finding his feet at left-back. But the renowned star has also had significant difficulties, as demonstrated by his rash handball that gave away a penalty in the heavy Champions League loss to PSV Eindhoven at Anfield.
It was captured in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a deserved lead, Van Dijk losing possession before backing away and turning away on a 25-yard shot that hit him and floated out of the reach of goalkeeper Alisson.
For a defender of such unquestionable quality, Van Dijk has an peculiar tendency of shying away on the ball, sometimes to Liverpool's disadvantage.
Misfortune at the conclusion, yes, but it was a situation Van Dijk courted with his atypical failure to take charge, Sunderland's Talbi seizing the moment.
"Van Dijk loses the ball 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 imperious, but right now he's slipping up and doubting himself."
As with Salah, a player of Van Dijk's caliber must not be discarded after securing two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a illustrious Liverpool career.
He has, though, looked a shadow 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 brimming with experience, it was lacking here. No-one was inspiring a team that once again looked clueless to take control by the throat.
Van Dijk's subpar showing, which ended with him being used as the last resort of acting as an last-ditch attacker, was symptomatic of a deeply underwhelming Liverpool performance - which made Sunday's win at West Ham seem like the outlier rather than the norm.
Slot persisted with the side that stopped 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 looked to him for inspiration. It never came, with £125m Alexander Isak also quiet after scoring his first with his first league goal for Liverpool on Sunday.
Slot would have been under increased scrutiny had Florian Wirtz's 81st-minute shot not taken a deflection off Nordi Mukiele to set up what Liverpool hoped would be a thrilling finale.
A late scare came - but at the other end. Liverpool were only avoided defeat 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 struggling title-holders ultimately had to accept the point 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 sluggish, labored and devoid of creativity. Even the typical final push after the equaliser carried little conviction. Performances like this are the reason their title defence has crumbled.
But full acknowledgment for the Reds' struggles on Wednesday must be given to Sunderland, who are being seeing the results for a summer of serious ambition in the transfer market, coupled with the fine work of Regis le Bris.
The Black Cats were proactive, confident and threatening.
Sunderland are now sixth in the Premier League with 23 points. It is telling 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 time for reflection.
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