The intense focus that has fallen upon one global Liverpool great turned to another on Anfield's fresh disappointing night.
Mohamed Salah has faced examination for his struggles this campaign - and was consigned to the sidelines for the second straight Premier League game as the Black Cats arrived on Wednesday.
But it was captain Virgil van Dijk, a peerless defensive foundation as Liverpool have swept up the full collection of major prizes, whose poor form became the focus during the draw.
Van Dijk, 34, and Salah, 33, both inked new lucrative two-year deals in the summer, with barely a Liverpool eyebrow raised at the notion of securing the futures to a veteran duo much closer to the end of their careers than the start.
Truly, it was a cause of celebration - but now there is no escaping the brutal reality that standards have dropped alarmingly for both.
Liverpool have been vulnerable in defence ever since manager Arne Slot and the club's recruitment team began a £450m summer rebuild that has yet to prove anything like a good return.
Concurrently, Van Dijk has started to lose the air of invincibility he has carried since his £75m switch from Southampton in January 2018.
Van Dijk has received little support by center-back colleague Ibrahima Konate's dramatic dip, along with Milos Kerkez struggling to adapt at left-back. But the renowned star has also struggled badly, as highlighted by his rash handball that resulted in a penalty in the heavyweight Champions League loss to PSV Eindhoven at Anfield.
It was exemplified in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a well-earned lead, Van Dijk giving the ball away before standing off and turning his back on a 25-yard shot that struck him and floated out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an peculiar tendency of shying away on the ball, sometimes to Liverpool's disadvantage.
Misfortune at the finale, yes, but it was a situation Van Dijk courted with his uncharacteristic failure to take charge, Sunderland's Talbi taking advantage.
"Van Dijk gives the ball away and then he just drops off. It's the incorrect choice. 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 hesitating."
As with Salah, a player of Van Dijk's caliber must not be dismissed after securing 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 imperious self 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 exclusive domain alone in a Liverpool team packed with experience, it was lacking here. No-one was rousing a team that once again looked bewildered to grab the game by the initiative.
Van Dijk's difficult night, which ended with him being used as the last resort of acting as an makeshift forward, was representative 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 halted a run of nine losses in 12 games at London Stadium, Salah once more starting on the sidelines.
The Egyptian emerged at the start of the second half as the Kop pinned hopes on him for inspiration. It was not forthcoming, with £125m Alexander Isak also ineffective after scoring his first with his first league goal for Liverpool on Sunday.
Slot would have been under greater pressure 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.
Late drama came - but at the other end. Liverpool were only avoided defeat 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 underperforming defending champions 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 slow, ponderous and lacking in ideas. Even the typical final push after the equaliser carried scant belief. Displays 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 seeing the results for a summer of serious ambition in the transfer market, coupled with the superb management of Regis le Bris.
The Black Cats were positive, assured and a genuine threat.
Sunderland are now sixth in the Premier League with 23 points. It is indicative of the manner in which they have adapted to life in the Premier League that they will be disappointed they left Anfield without adding two more to their tally.
For Slot and Liverpool, it is time for reflection.
Elena es una escritora apasionada por la psicologĆa y los sueƱos, con experiencia en blogging y anĆ”lisis de temas existenciales.