The unforgiving spotlight that has centered around one elite Liverpool legend turned to another on Anfield's most recent disappointing night.
The Egyptian forward has faced examination for his struggles this season - and was relegated to the bench for the consecutive Premier League game as the Black Cats came to town on Wednesday.
But it was leader Virgil van Dijk, a peerless defensive rock as Liverpool have collected the full collection of major prizes, whose dip in performance became the focus during the stalemate.
Van Dijk, 34, and Salah, 33, both inked new lucrative two-year deals in the summer, with not one Liverpool eyebrow raised at the idea of securing the futures to a seasoned pair much nearer to the end of their careers than the start.
In fact, it was a reason for joy - but now there is no denying the stark fact that levels have fallen alarmingly for both.
Liverpool have been exposed in defence ever since head coach Arne Slot and the club's recruitment team began a £450m summer refit that has yet to prove anything like its worth.
Concurrently, Van Dijk has started to forfeit the sense of being untouchable he has carried since his £75m move from Southampton in January 2018.
Van Dijk has not been helped by center-back colleague Ibrahima Konate's collapse in form, along with Milos Kerkez failing to settle at left-back. But the renowned star has also fought his own battles, as demonstrated by his desperate handball that conceded 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 losing possession before backing away and turning away on a 25-yard shot that deflected off him and drifted out of the reach of goalkeeper Alisson.
For a defender of such unquestionable quality, Van Dijk has an peculiar tendency of shying away on the ball, sometimes to Liverpool's cost.
Misfortune at the conclusion, yes, but it was a situation Van Dijk invited with his unusual failure to act decisively, Sunderland's Talbi taking advantage.
"Van Dijk surrenders possession 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 imperious, but right now he's making mistakes and second-guessing himself."
As with Salah, a player of Van Dijk's caliber must not be discarded after securing 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 dominant persona this season, with the lowest recovery numbers 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 exclusive domain alone in a Liverpool team packed with experience, it was missing here. No-one was motivating a team that once again looked bewildered to grab the game by the scruff of the neck.
Van Dijk's difficult night, which ended with him being used as the emergency option of acting as an makeshift forward, was indicative of a horribly mediocre Liverpool performance - which made Sunday's win at West Ham seem like the exception rather than the norm.
Slot kept faith 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 pinned hopes on him for inspiration. It never came, with £125m Alexander Isak also anonymous 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 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 avoided defeat in stoppage time when Federico Chiesa's outstanding recovery run allowed him to turn Sunderland substitute Wilson Isidor's shot off the line after he had rounded 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 lethargic, ponderous and devoid of creativity. Even the traditional late rally after the equaliser carried minimal threat. Displays like this are the reason their defense of their crown has collapsed.
But significant praise 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 adventurous, self-believing and threatening.
Sunderland are now sixth in the Premier League with 23 points. It is indicative of the manner in which they have embraced 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 back to the drawing board.
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