It may seem churlish to talk about defending when Liverpool are setting all time goalscoring records, but it will be the key to their season.
Yes, they have kept three clean sheets in the past week, and scored a combined total of 10 goals in the process... but that has masked, somewhat, a lingering concern at the back.
The headline figures ignore it of course. In dismantling a poor Southampton back line which was set up all wrong to counter the threat of Sadio Mane and Mohamed Salah, Andy Robertson and Trent Alexander-Arnold, Liverpool equalled yet another all time top flight record.
They have now scored two or more goals in their last 17 matches in all competitions, equalling a mark set by Sunderland back in 1927.
Perhaps even more remarkably, they have an average of three goals in every Premier League game they’ve played this season.
It is historic stuff, but still Southampton could so easily have scored three or four themselves, but for the enduring excellence of keeper Alisson, who made three fine saves, two in one-on-one situations.
And if the fans tend to overlook these things, then manager Jurgen Klopp does not. For him, with his usual forensic insight, it is a problem which must be sorted if his side are to win honours this season.
Liverpool are scoring freely again, because they now have stability once more with four senior centre halves available, instead of one, and Virgil van Dijk continuing his impossible record of never having lost a Premier League game at Anfield...in 54 matches, so far.
But Klopp added seriously: “Talking about stability, I was not happy with the chances we conceded today, to be honest.
“I have no problem that (keeper) Ali has to make saves in a football game but these saves were too spectacular. One-on-one with the goalie should not happen twice in a game, for sure not.
“We have to really work on that. We have to be as stable, serious, ruthless defensively as possible. That then gives us the platform to play football, create and score.
“It will not be forever that we score two goals per game. It happened so far, so, good. But if we win a game 1-0 then I’m happy as well.”
When Salah and Mane are so devastating and both Liverpool full backs so incredible in their delivery, and Diogo Jota so clinical in his ghosting penalty area movement and finishing, then Alisson will not get the focus.
But he made three superb saves, two when the score was only 1-0, and in recent weeks has consistently been the difference between dropped points and emphatic Liverpool victories.
He did cost £70m of course, so you’d expect him to be more than decent. But still, the Reds must sort out their back line. They were exposed at West Ham and Brentford, and even by Brighton at Anfield.
New signing Ibrahima Konate still looks all at sea, a nervous figure here with too much tendency to turn over the ball in dangerous areas, that has been clearly noted by opponents.
Joel Matip can only play one game a week, and Joe Gomez coming back from another injury, so if there is an area where Liverpool can be exposed, then it is at the back.
With the Reds, astonishingly, boasting the top three in the Premier League scoring charts this season it may not matter of course, but it is still a concern Klopp surely must address.