The intense spotlight that has fallen upon one global Liverpool legend shifted to another on Anfield's latest disappointing night.
Mohamed Salah has been under scrutiny for his subpar performances this campaign - and was relegated 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 peerless defensive rock as Liverpool have secured the array of major trophies, whose struggles took center stage during the draw.
Van Dijk, 34, and Salah, 33, both signed high-value two-year deals in the summer, with scarcely a Liverpool concern voiced at the prospect of securing the futures to a veteran duo much approaching the end of their careers than the start.
In fact, 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 vulnerable in defence ever since head coach Arne Slot and the club's recruitment team embarked on a £450m summer refit that has still to demonstrate anything like its worth.
At the same time, 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 center-back colleague Ibrahima Konate's collapse in form, along with Milos Kerkez struggling to adapt at left-back. But the esteemed defender has also fought his own battles, as highlighted by his rash handball that conceded a penalty in the significant 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 giving the ball away before standing off and turning his back on a 25-yard shot that deflected off him and floated out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an unusual habit of turning away on the ball, sometimes to Liverpool's detriment.
Ill fortune at the end, yes, but it was a situation Van Dijk invited with his unusual failure to act decisively, Sunderland's Talbi seizing the moment.
"Van Dijk loses the ball and then he just backs 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 faultless. Every game he was commanding, but right now he's erring and second-guessing himself."
As with Salah, a player of Van Dijk's stature 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 worst recoveries 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 brimming with experience, it was missing here. No-one was inspiring a team that once again looked bewildered to grab the game by the throat.
Van Dijk's difficult night, which ended with him being used as the emergency option of acting as an emergency striker, was representative of a horribly mediocre Liverpool performance - which made Sunday's win at West Ham seem like the exception rather than the rule.
Slot stayed 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 came on at the start of the second half as the Kop turned to him for inspiration. It never came, with £125m Alexander Isak also ineffective after opening his account 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 dramatic ending.
A late scare came - but at the other end. Liverpool were only spared embarrassment in stoppage time when Federico Chiesa's outstanding recovery run allowed him to turn Sunderland substitute Wilson Isidor's shot off the line after he had beaten keeper Alisson.
Slot and his struggling title-holders 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 lethargic, labored and short on invention. Even the customary late surge after the equaliser carried scant belief. Performances like this are the reason their attempt to retain the title has fallen apart.
But full acknowledgment for the Reds' struggles on Wednesday must be given to Sunderland, who are being reaping the benefits for a summer of serious ambition in the transfer market, coupled with the excellent coaching 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 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 back to the drawing board.