The glaring attention that has fallen upon one elite Liverpool great shifted to another on Anfield's latest desperate night.
Mohamed Salah has come under fire for his struggles this campaign - and was placed on the sidelines for the second successive Premier League game as the Black Cats visited on Wednesday.
But it was skipper Virgil van Dijk, a peerless defensive bedrock as Liverpool have swept up the complete set of major prizes, whose dip in performance came under the microscope during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both inked lucrative new 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 reason for joy - but now there is no avoiding the brutal reality that standards have dropped concerningly for both.
Liverpool have been exposed in defence ever since head coach Arne Slot and the club's scouting department began a £450m summer rebuild that has not yet shown anything like value for money.
Simultaneously, Van Dijk has started to forfeit the sense of being untouchable he has carried since his £75m transfer from Southampton in January 2018.
Van Dijk has faced additional challenges by defensive partner Ibrahima Konate's collapse in form, along with Milos Kerkez struggling to adapt at left-back. But the esteemed defender has also struggled badly, as proved by his desperate handball that gave away a penalty in the heavy Champions League loss to PSV Eindhoven at Anfield.
It was exemplified in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a merited lead, Van Dijk losing possession before backing away and averting his body on a 25-yard shot that struck him and looped out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an unusual habit of shying away on the ball, sometimes to Liverpool's detriment.
Ill fortune at the conclusion, yes, but it was a situation Van Dijk courted with his unusual failure to act decisively, Sunderland's Talbi taking advantage.
"Van Dijk gives the ball away 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 erring and second-guessing 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 illustrious Liverpool career.
He has, though, looked a pale imitation of his usual commanding presence this season, with the lowest recovery numbers 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 sole responsibility alone in a Liverpool team brimming with experience, it was lacking here. No-one was inspiring a team that once again looked lost to grab the game by the scruff of the neck.
Van Dijk's subpar showing, which ended with him being used as the emergency option of acting as an makeshift forward, was indicative of a distinctly poor Liverpool performance - which made Sunday's win at West Ham seem like the exception rather than the standard.
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 was not forthcoming, with £125m Alexander Isak also ineffective after opening his account 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 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 spared embarrassment 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 struggling title-holders ultimately had to accept the point 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 sluggish, unimaginative and lacking in ideas. Even the traditional late rally after the equaliser carried scant belief. Performances like this are the reason their defense of their crown has collapsed.
But huge credit for the Reds' struggles on Wednesday must be given to Sunderland, who are being rewarded for a summer of notable ambition in the transfer market, coupled with the excellent coaching of Regis le Bris.
The Black Cats were adventurous, assured and dangerous.
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 back to the drawing board.