The glaring spotlight that has been trained on one elite Liverpool great turned to another on Anfield's fresh disappointing night.
Mohamed Salah has come under fire for his subpar performances 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 skipper Virgil van Dijk, a exceptional defensive rock as Liverpool have swept up the complete set of major prizes, whose struggles became the focus during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both signed new lucrative two-year deals in the summer, with not one Liverpool question asked at the idea of handing contracts to a veteran duo much closer to 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 performance has dipped alarmingly for both.
Liverpool have been exposed in defence ever since manager Arne Slot and the club's transfer committee began a £450m summer refit that has still to demonstrate anything like value for money.
Concurrently, Van Dijk has started to forfeit the sense of being untouchable he has held since his £75m transfer from Southampton in January 2018.
Van Dijk has not been helped by fellow defender Ibrahima Konate's collapse in form, along with Milos Kerkez failing to settle at left-back. But the great Dutchman has also fought his own battles, as proved by his rash handball that resulted in 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 well-earned lead, Van Dijk surrendering the ball before backing away and turning away on a 25-yard shot that struck him and looped out of the reach of goalkeeper Alisson.
For a defender of such unquestionable quality, Van Dijk has an unusual habit of turning his back on the ball, sometimes to Liverpool's detriment.
Bad luck at the conclusion, yes, but it was a situation Van Dijk courted with his uncharacteristic failure to act decisively, Sunderland's Talbi taking advantage.
"Van Dijk gives the ball away 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 imperious, but right now he's erring and hesitating."
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 stellar 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 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 full of experience, it was absent here. No-one was rousing 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 makeshift forward, was indicative of a deeply underwhelming Liverpool performance - which made Sunday's win at West Ham seem like the outlier rather than the standard.
Slot persisted with the side that stopped 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 turned to him for inspiration. It failed to materialize, with £125m Alexander Isak also ineffective after getting off the mark 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.
Stoppage-time tension 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 sluggish, labored and devoid of creativity. Even the traditional late rally after the equaliser carried scant belief. Performances like this are the reason their attempt to retain the title has fallen apart.
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 fine work of Regis le Bris.
The Black Cats were positive, confident and dangerous.
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.
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Andrew Day
Andrew Day