Breed & Gender Help Please!

I'm hoping you guys can help me identify a few of my chicks. I ordered them from McMurray's hatchery, and they're 6 weeks old at this point, but if they're younger in the pics, I'll mention that. Thanks in advance!

This one is obviously a roo, but I have no idea on the breed. He was one of the "chipmunk" looking chicks when he was a baby.



This one is also a mystery - both breed and gender. He has 4 toes, and I don't think McMurray has silkies anyway, but I swear he looks part silkie to me. His feet are a yellowy-gray color, and his feathers are mostly white with a couple of gray and even 1 buff coming in. Very odd.
Here's a baby picture (less than a week old):

And this is him at 6 weeks:


I believe this is a silver-spangled hamburg roo?
1 week old:

5 weeks old:


And last but not least, I believe this guy is a cochin, but I'm not sure what variety (i.e. what he'll look like when he's grown up). Also, not sure on the gender, so here are a few pics of him at 6 weeks:

Please say pullet on this one - he's my most friendly chick! He hops right into my lap and onto my arm whenever I go in the coop.

Thanks for your help!