The glaring focus that has centered around one elite Liverpool legend shifted to another on Anfield's latest frustrating night.
Mohamed Salah has been under scrutiny for his subpar performances this campaign - and was relegated to the substitutes' bench for the second successive Premier League game as the Black Cats came to town on Wednesday.
But it was skipper Virgil van Dijk, a peerless defensive foundation as Liverpool have collected the complete set of major prizes, whose dip in performance took center stage during the stalemate.
Van Dijk, 34, and Salah, 33, both agreed to high-value two-year deals in the summer, with not one Liverpool eyebrow raised at the idea of offering extensions to a veteran duo much nearer to the end of their careers than the start.
Indeed, it was a cause of celebration - but now there is no avoiding the stark fact that standards have dropped worryingly for both.
Liverpool have been exposed in defence ever since boss Arne Slot and the club's transfer committee began a £450m summer refit that has yet to prove anything like value for money.
At the same time, Van Dijk has started to forfeit the air of invincibility he has held since his £75m transfer from Southampton in January 2018.
Van Dijk has faced additional challenges by defensive partner Ibrahima Konate's loss of form, along with Milos Kerkez not finding his feet at left-back. But the esteemed defender has also had significant difficulties, as proved by his desperate handball that conceded a penalty in the significant 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 surrendering the ball before retreating and averting his body on a 25-yard shot that deflected off him and looped out of the reach of goalkeeper Alisson.
For a defender of such unquestionable quality, Van Dijk has an peculiar tendency 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 courted with his uncharacteristic failure to act decisively, Sunderland's Talbi taking advantage.
"Van Dijk surrenders possession and then he just drops off. It's the mistake. 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 doubting himself."
As with Salah, a player of Van Dijk's pedigree must not be dismissed 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 faded version of his usual imperious self this season, with the poest ball recovery rate per game during his Liverpool career, while tackles and interceptions are also down on last season.
And, while leadership should not be Van Dijk's sole responsibility alone in a Liverpool team packed with experience, it was missing here. No-one was inspiring a team that once again looked lost to grab the game by the throat.
Van Dijk's subpar showing, which ended with him being used as the desperate measure of acting as an last-ditch attacker, was indicative of a deeply underwhelming Liverpool performance - which made Sunday's win at West Ham seem like the anomaly rather than the norm.
Slot persisted with the side that halted a run of nine losses in 12 games at London Stadium, Salah once more observing from the sidelines.
The Egyptian was introduced 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 anonymous 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 grandstand finish.
Late drama 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 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 slow, ponderous and short on invention. Even the typical final push after the equaliser carried scant belief. Performances like this are the reason their title defence has crumbled.
But huge credit for the Reds' struggles on Wednesday must be given to Sunderland, who are being rewarded for a summer of clear intent in the transfer market, coupled with the superb management of Regis le Bris.
The Black Cats were adventurous, self-believing and a genuine threat.
Sunderland are now sixth in the Premier League with 23 points. It is telling of the manner in which they have grown into 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 a case of going back to basics.
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