The Graves pick didn't count until 9am today, if nobody wants him thats his leftover pick for today.
I would say it doesn't count until he picks him after 9am EST today. So IMO Graves is still out there for anyone to draft.
Announcers don't really make sense to draft because ideally I visualize myself being in the crowd and taking in each card. So that's what I choose my pick on.
They make sense to announce taking the approach that it would be televised or broadcast. I don't think commentary or would completely make or break a card (well maybe if Kenny Fleurier is on commentary), but I would say it enhances it.