Liverpool went from a very fluid interchanging Mane, Firmino and Salah to a very rigid Diaz, Nunez, Salah.
I must admit I was very surprised Klopp was so keen on Nunez. He’s not the type of player I see in a Klopp system. He’s certainly not the type who will have fast interchange passing with other players around him who link up with him. He will be a player who wants crosses into the box which Liverpool will provide but how will it affect Salah and Diaz because they certainly won’t be the ones supplying crosses and they won’t really have a player like Firmino or Mane to interchange with. Going to be interesting to see how he gets on.
But I currently see Liverpools front 3 as a significant downgrade at this moment in time compared to their front 3 of 2/3 years ago.
Nunez does seem a very Lewandowski type player from back at Dortmund. Someone who is strong with the technical ability to hold the ball and play passes (though I personally don't think he's technically very strong).
In terms of positioning it only looks rigid if you look at the stature of Nunez. You would not expect a big, strong forward to be part of a fluid interchanging system but Nunez has played on the left wing for Benfica, and especially during big matches. From the match compliations I've seen, he also likes to run with the ball as he is quick, so he can definitely switch positions with Salah or Diaz, though I don't think he will be nearly as effective as Firmino/Jota were as they are seem like much better passers.
Nunez gives them an option to playing with a big number 9 who can play creative passes with the wingers, like Lewandowski did with Reus, Gotze/Kuba at Dortmund with Klopp, and someone who can rotate to the wings if he needs to play that system.
It's still a very risky signing for me as he's only had one great season in a good European league, so you would want a bigger body of work before bidding 70 mil. I don't see it this far to be honest.