Cobb was a sadistic racist prick who beat up a disabled person. Rodriguez might be a snitch, and a narcissist, but I doubt he'd stoop that low. As for Rose, I have zero doubt he gambled against his own team.
Speaking of "book writers," Jose Canseco has to be the ultimate bitch. Not only did he snitch on a bunch of players, but he's a total douche. I think he said something like he ran a 3.9 40 yard dash, which would be fastest recorded time ever. He also hit his wife. He's definitely worse than Rodriguez.