Deryk was definitely a surprise. That performance of the Catalyst was kind of stunning. I always have only known him for the pop punk stuff of Sum 41. I agree that chemistry between members in a band can NOT be understated. I would say that is even more important than the musical talent you have in a band (which seems dubious to say but your talent can't save the band). A lack of chemistry and bad vibes can tear apart a band and therefore ruin productivity and the potential for good music.