The glaring focus that has been trained on one world-class Liverpool great switched to another on Anfield's fresh disappointing night.
The Egyptian forward has come under fire for his subpar performances this campaign - and was relegated to the bench 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 collected the full collection of major trophies, whose dip in performance came under the microscope during the stalemate.
Van Dijk, 34, and Salah, 33, both inked lucrative new two-year deals in the summer, with not one Liverpool eyebrow raised at the idea of handing contracts to a veteran duo much nearer to the end of their careers than the start.
Indeed, it was a reason for joy - but now there is no escaping the brutal reality that levels have fallen concerningly for both.
Liverpool have been exposed in defence ever since manager Arne Slot and the club's recruitment team undertook a £450m summer refit that has still to demonstrate anything like its worth.
At the same time, Van Dijk has started to lose the aura of invulnerability he has possessed since his £75m move from Southampton in January 2018.
Van Dijk has faced additional challenges by defensive partner Ibrahima Konate's dramatic dip, along with Milos Kerkez failing to settle at left-back. But the renowned star has also had significant difficulties, as proved by his panic-stricken handball that gave away a penalty in the significant 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 losing possession before backing away 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 proven caliber, Van Dijk has an curious trait of turning away on the ball, sometimes to Liverpool's cost.
Ill fortune at the conclusion, yes, but it was a situation Van Dijk courted with his unusual failure to make a decisive move, Sunderland's Talbi taking advantage.
"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 couldn't make a mistake. Every game he was dominant, but right now he's erring and second-guessing himself."
As with Salah, a player of Van Dijk's pedigree must not be written off after winning 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 dominant persona this season, with the lowest recovery numbers per game during his Liverpool career, while defensive actions are also down on last season.
And, while leadership should not be Van Dijk's preserve alone in a Liverpool team brimming with experience, it was lacking here. No-one was rousing a team that once again looked clueless to seize the initiative by the initiative.
Van Dijk's subpar showing, which ended with him being used as the emergency option of acting as an last-ditch attacker, was representative of a distinctly poor Liverpool performance - which made Sunday's win at West Ham seem like the outlier rather than the standard.
Slot kept faith 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 was introduced at the start of the second half as the Kop turned to him for inspiration. It was not forthcoming, with £125m Alexander Isak also anonymous 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 been turned in off Nordi Mukiele to set up what Liverpool hoped would be a grandstand finish.
A late scare 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 beaten keeper Alisson.
Slot and his underperforming defending champions ultimately had to settle for a draw 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 short on invention. Even the traditional late rally after the equaliser carried minimal threat. Showings 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 rewarded for a summer of serious ambition in the transfer market, coupled with the fine work of Regis le Bris.
The Black Cats were proactive, confident and dangerous.
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 time for reflection.
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