The departure of both of them ruined the bands dynamic in my opinion. Derek is an extremely good drummer, and is far more talented at that than his bullshit rap. And Kevin traded in his good guitar work and awesome clean vocals to play breakdowns. Such a waste, I still jam their second album here and there.
You do realize the one ADTR album Kevin has been featured on features a grand total of two songs with breakdowns, right? And that he actually sings some clean vocals on that same record? Okay, just checking.