I wondered also about Cap assuming both comm and PF duties. The female FO seemed the only one clear, and presumably on Comm at the start , w him PF.
At one point she said "go ahead sir" and a second later he says "go ahead mam". Perhaps at this point he decides to Comm also?
Plus him confirming both 20 and 02 a couple of times in succession, he did NOT sound on the ball at all.
The CVR will be interesting.