6 week old silkies- genders?

[Lunes]

These guys are 6 weeks old- I think the first white one is a roo, cuz of the pronounced wattle. But I don’t really have much experience so I could be wrong. The black one looks like a pullet to me, the buff one is MASSIVE, but I can’t tell myself if it’s a pullet or a roo. What do you guys think?

6 chicks total-
2 white chicks - one has shorter tail feathers because of pasty Butt and they keep growing in downwards so I keep cutting them. I don’t think I got any good photos of that one so it’s just the one with the big wattle
2 grey chicks
1 black chick
1 buff

 

[JedJackson]

I think the second white one is a cockerel.

The black or dark gray one in the third picture is a potential cockerel.

The dark one in the seventh picture is maybe a cockerel.

Not sure on the last two, though. It's very early to try to sex silkies. They often take a long time to figure out. The rest look like pullets so far.