Is "Mickey Chicken" a room or hen?

[goosebutton]

Hi, I have a couple silkes chicks, about 16-18 weeks old, I'm not positive. The little black one my 2 yr old names "Mickey Chicken" (because it isn't a "Mouse"). This guy, Mickey is larger than our grey one (hatched at the same time) and its comb and waddle are more developed. I want to say he's a rooster but I'd like second opinions from anyone who may know the breed more than I do. I really do hope he is a rooster...
I've uploaded pictures. The first two (the photos with the blue shed in the background) are of the grey one that I think is a hen. The second and third pictures are of Mickey Chicken, the guy in question. The fourth and fifth pictures have both chickens in them for a size comparison. I'd love some feedback. Thanks!

 

[goosebutton]

So the order of the the photos is a little off. Dang smart phones.
The pictures with the blue shed I think is a hen. The pictures without the shed I think is a roo. Thoughts?

 

[Crazy for Chickens!]

I think you are correct!