Good defenders can mark Salah out of the game noting he is a one sided player , very ordinary with the ball on his right side.
Away from home they were dross in the Chumps League last year and really should not have qualified beyond the group stage and in the domestic cups they threw games against Liverpool and Wolves ( again ) in order to keep their League hopes alive for as long as possible.
Arsenal are not better this season than last especially away from home ( haven't own against atop 6 side away for over 4 years ) and yet Liverpool struggled to blow them away at home as they have done in previous years and have the game wrapped up in the first 30 minutes.
Pep wants to win everything and in one season if possible as his history shows.
Klopp knows his team are not capable of going deep in four comps and in the end puts his eggs in one basket.