Found this! try check Jamie Bower as Caius in Breaking Dawn part 1 End scenes.
Jamie Bower revealed how he think about his role in Twilight movie which he play as Caius.
“In the last film, New Moon, there’s a scene where we rip this guy apart,” he said with a little too much enthusiasm.
“It was gross and grim, and my character just sat there smiling and enjoying it. When I got the script, I knew that was the one I wanted the most.”
2 few page scans from Time magazine November 2009 issue. have show Jamie as Caius
In an interview with EW.com ask that is Jamie glad on Caius role? Jamie reveal that his first auditioning for the role of Demetri in New Moon. but they’re said he’s better as Caius!
“I was originally auditioning for the role of Demetri in New Moon, and then they said, “We think you’d be more fitting as Caius.” And I said, “Well that’s very kind of you, I’d love to come along and play him.” And I was aware of the character, I was aware very much of the particularly strong presence the Volturi have in Breaking Dawn.” Jamie added