Think you are right about Nigel...rooster through and through. Claude however may very well be Claudine. Hard to tell from just pictures at this age but based on their comb development for 5 weeks that would be my guess.
It's funny because a week ago he was looking so far behind Claude that I would've sworn he was a pullet. But now he's looking more roo-like every day. Claude I'm still on the fence about.