Cañas was proved to be innocent, and Agassi's drug use wasn't even PEDs. It's like hating Gasquet because of the coke thing.
Which is the Blake incident you mentioned?? I can't remember. And Ferrero seems like a cool guy, maybe I missed something
Cañas was still suspended. Agassi got the ATP to cover up a positive test, he was linked to doping as well, then there were plenty of classless antics. Catching a serve in a DC tie, mocking Karol Kucera's balltoss, plenty of bullshit with Agassi.
Just do a search here on Blake and Round Robin all the info is there if you really want to know the details. Ferrero there was the Davis Cup 2004 final where he didn't handle the fact he was passed over for Nadal in the singles and bitched throughout the tie.