I guess for me, to have a LEGENDARY status, you would have to be either 2 things:
1. Sacrifice termendously for 1 club and show much loyalty and whilst at the sametime proving very influencial for the club on and off the pitch. A devoted servant if you will and a club symbol. But I note, that love and loyalty is not enough IMO, the player has to perform at top level also.
ex: Del Piero
2. A renown worldclass players who is considered the top 10 players of his era. And plays at least 3 years with the club while performing at that top level during his stint at the club. In short, also one of the club's symbol during his time there and one of the Football's Legends in General.
ex: Zidane
Those are IMO, the two reasons that can lift somebody into Club LEGENDARY status.
Is Trezeguet a JUVE legend? I think its somewhat borderline, he's almost IN due to my 1st arguement and considering his goal scoring record for Juve, he certainly has a case. But I would really like to reserve the word "JUVE LEGEND" for a handful of very very influencial players of the club.
I mean, Im sorry for Tacchi fans, but I don't consider Tacchinardi to be a club legend. Because if you did, than Pessotto and Birindelli would also be considered, and a whole lot of other players who spend most it not all their career at Juventus.
I'm sorry, they are LOYAL SERVANTS, but not JUVE LEGENDS by my books.