I'm no expert on the Bundesliege mate so I could be miles far from the mark, but isn't Haaland more your regular kind of number 9? He's 6 ft 4" I think and I had assumed he's more of an Edin Dzeko than an Eden Hazard.
Pep seems to like midfield players who can keep the ball and retain possession rather than your average shoot-on-sight number 9. He's fielded plenty of sides with no out and out strikers at all - last night for example!
As I read Pep say in the papers recently, “If we dream that the striker is going to solve our problems, we are not going to win the games. What will help us to still be there is the way we play".