Monte Kiffin is the reason Sapp didn't finish his career in Tampa. Kiffin essentially picked Booger McFarland over Sapp for the front office, so Sapp was left having to sign with another team once his contract was up.
Blame him for signing with the Raiders? Well, he had the championship ring, the career, and the numbers. Hard to fault him for going after the best payday available, at that point. Wasn't the second option Cincinnati, if memory serves correct? Eh, who knows how that would have worked out, although at least Sapp would have been kept in a 4-3 for the duration of his time there.
Pugnacity, testosterone, truculence, and belligerence.