In contrast to the Garcia transfer, there really is no upside here.
At BEST, he replicates his Liverpool form, which was a very inconsistent player who suffered from weak finishing, underwhelming stats and poor decision making. A player who dribbles past 4 players but does nothing at the end of it.
He is not suddenly going to become world class at 28, folks. But Liverpool are expecting a 'world class' fee. How Barca are not seeing this I'm not quite sure.
You pay 70m for a 28 year old, he has to be a slam dunk. Otherwise you have another Countinho, Griezmann situation on your hands.
You bring Diaz in, he changes NOTHING. Not one thing. The team will be as good as it was this year. Zero improvement. Now you could go and get Gyokeres for around the same price and you suddenly have a pressing machine, with great long range shooting, strength, hold up play, speed and acceleration and direct free kicks ( A big weakness in our team ).
Now imagine how better we would be with someone that brings all those attributes to our team.