The intense focus that has been trained on one elite Liverpool legend switched to another on Anfield's most recent desperate night.
Mohamed Salah has been under scrutiny for his poor form this campaign - and was placed on the sidelines for the second successive Premier League game as the Black Cats arrived on Wednesday.
But it was leader Virgil van Dijk, a unmatched defensive rock as Liverpool have collected the array of major prizes, whose poor form took center stage during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both agreed to lucrative new two-year deals in the summer, with scarcely a Liverpool concern voiced at the idea of securing the futures to a seasoned pair much nearer to the end of their careers than the start.
Truly, it was a moment of optimism - but now there is no escaping the brutal reality that standards have dropped concerningly for both.
Liverpool have been vulnerable in defence ever since head coach Arne Slot and the club's scouting department undertook a £450m summer overhaul that has not yet shown anything like value for money.
Concurrently, Van Dijk has started to forfeit the aura of invulnerability he has held since his £75m move from Southampton in January 2018.
Van Dijk has faced additional challenges by center-back colleague Ibrahima Konate's loss of form, along with Milos Kerkez failing to settle at left-back. But the renowned star has also struggled badly, as demonstrated by his panic-stricken handball that gave away a penalty in the heavyweight Champions League loss to PSV Eindhoven at Anfield.
It was captured in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a merited lead, Van Dijk losing possession before retreating 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 unusual habit of turning his back on the ball, sometimes to Liverpool's disadvantage.
Ill fortune at the finale, yes, but it was a situation Van Dijk provoked with his atypical failure to make a decisive move, Sunderland's Talbi taking advantage.
"Van Dijk loses the ball and then he just retreats. 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 faultless. Every game he was dominant, but right now he's making mistakes and doubting himself."
As with Salah, a player of Van Dijk's caliber must not be written off after winning two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a glittering Liverpool career.
He has, though, looked a shadow of his usual dominant persona this season, with the poest ball recovery rate per game during his Liverpool career, while defensive actions are also down on last season.
And, while leadership should not be Van Dijk's exclusive domain alone in a Liverpool team packed with experience, it was absent here. No-one was motivating a team that once again looked bewildered to grab the game by the scruff of the neck.
Van Dijk's poor display, which ended with him being used as the emergency option of acting as an last-ditch attacker, was representative of a deeply underwhelming Liverpool performance - which made Sunday's win at West Ham seem like the anomaly rather than the rule.
Slot kept faith with the side that stopped a run of nine losses in 12 games at London Stadium, Salah once more watching from the sidelines.
The Egyptian emerged at the start of the second half as the Kop turned to him for inspiration. It failed to materialize, with £125m Alexander Isak also anonymous after scoring his first with his first league goal for Liverpool on Sunday.
Slot would have been under even more pressure had Florian Wirtz's 81st-minute shot not deflected in off Nordi Mukiele to set up what Liverpool hoped would be a grandstand finish.
Stoppage-time tension 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 dribbled past keeper Alisson.
Slot and his fading champions 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 lethargic, ponderous and lacking in ideas. Even the typical final push after the equaliser carried little conviction. Displays like this are the reason their title defence has collapsed.
But huge credit for the Reds' struggles on Wednesday must be given to Sunderland, who are being seeing the results for a summer of clear intent in the transfer market, coupled with the fine work of Regis le Bris.
The Black Cats were positive, assured and threatening.
Sunderland are now sixth in the Premier League with 23 points. It is indicative 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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