The glaring spotlight that has centered around one elite Liverpool legend shifted to another on Anfield's most recent desperate night.
The Egyptian forward has come under fire for his subpar performances this season - and was relegated to the sidelines for the second successive Premier League game as the Black Cats arrived on Wednesday.
But it was leader Virgil van Dijk, a peerless defensive bedrock as Liverpool have swept up the array of major prizes, whose dip in performance came under the microscope during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both agreed to lucrative new two-year deals in the summer, with barely a Liverpool question asked at the notion of handing contracts to a veteran duo much nearer to the end of their careers than the start.
Truly, it was a moment of optimism - but now there is no avoiding the stark fact that levels have fallen worryingly for both.
Liverpool have been vulnerable in defence ever since boss Arne Slot and the club's recruitment team began a £450m summer overhaul that has not yet shown anything like value for money.
At the same time, Van Dijk has started to lose the sense of being untouchable he has held since his £75m transfer from Southampton in January 2018.
Van Dijk has received little support by center-back colleague Ibrahima Konate's dramatic dip, along with Milos Kerkez failing to settle at left-back. But the esteemed defender has also struggled badly, as proved by his panic-stricken handball that resulted in a penalty in the heavyweight Champions League loss to PSV Eindhoven at Anfield.
It was encapsulated in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a deserved lead, Van Dijk losing possession before backing away and turning away on a 25-yard shot that struck him and floated 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 disadvantage.
Misfortune at the finale, yes, but it was a situation Van Dijk provoked with his atypical failure to make a decisive move, Sunderland's Talbi seizing the moment.
"Van Dijk surrenders possession and then he just retreats. 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 impeccable. Every game he was imperious, but right now he's erring and second-guessing himself."
As with Salah, a player of Van Dijk's pedigree must not be discarded 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 shadow of his usual imperious self this season, with the poest ball recovery rate 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 bewildered to seize the initiative 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 emergency striker, was indicative of a distinctly poor Liverpool performance - which made Sunday's win at West Ham seem like the outlier rather than the norm.
Slot stayed 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 looked to him for inspiration. It was not forthcoming, 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 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 dramatic ending.
A late scare came - but at the other end. Liverpool were only saved from humiliation 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 beaten keeper Alisson.
Slot and his fading champions ultimately had to settle for a draw 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 lethargic, unimaginative and short on invention. Even the customary late surge after the equaliser carried minimal threat. Displays like this are the reason their title defence has fallen apart.
But full acknowledgment for the Reds' struggles on Wednesday must be given to Sunderland, who are being reaping the benefits for a summer of notable ambition in the transfer market, coupled with the fine work 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 embraced life in the Premier League that they will be frustrated they left Anfield without adding two more to their tally.
For Slot and Liverpool, it is time for reflection.
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