Tuttosport isnt that reliable and they put too many bullshits that are so clearly in favor of Juve it is unreal .
There is no doubt that Tristan and Irrueta doesnt get along too well, and it is probably down to Tristan's laziness (My friend who saw Valencia vs Depor Supercup match couple years back described him as a fat bloated hamburger), and unwillingness to make runs. Beside, Walter Pandiani had a fantastic year last year and he has one heck of header.. However, I do think Tristan is available for a right price which Zala clearly isnt. Beside, I am not sure whether Juve should take Tristan's fat wage, huge ego, lack of work ethic, and declining form at his stage of career.
Far better to go for young hungry striker who has something to prove.