How can people think Diaz is better than him?
Probably because of his performances during 20/21 and the opening months of the 21/22 season.
Mane only started playing (consistently) to his pre 2020 level when he was moved up front after Afcon IMO, there were plenty on here who were critical of his performances since they won the title and probably all over the net because his poor form was highlighted on Sky Sports etc .
He was probably their best player in the closing months but that was with one foot out the door because it was fairly obvious that Diaz was the long term Mane replacement if we look at how Liverpool do their business.
Think that Liverpool are weakened IF the Mane from the past 6 months continues to show up, don't really think they are if the Mane of the previous 18 months returns.
They probably would have preferred to keep him around but he probably feels (rightly) undervalued and is sick to death of playing with Salah.
I know absolutely nothing about Nunez apart from the fact that Goldbridge is in love with him and a couple of Champions league games, Diaz was much more of a sure thing IMO after seeing his performances at the Copa America last summer (Think Nunez missed it with injury).
Think it's a bit of a coin toss with him.