I am not sure if it is Gwaine, but he is certainly, um, built along similar lines. I am usually really good at recognizing actors, but when they cut their hair or grow it out, I get all confused, hence my not knowing for many years that Indiana Jones and Han Solo were played by the same guy.

BTW, I just finished catching up on Merlin. I love it. And Gwaine needs to have more shirtless scenes. :)