As I understand it, at precisely the time the ice berg was sighted, the only Officer on the bridge keeping a look out was Murdoch.
When you put it like that. Yes.
Another to chalk up to the list of contributing factors. Lack of additional lookouts placed on watch.
In normal circumstances Boxhall wouldn't have been expected to lookout as he had navigational matters to attend to.
Moody would have presumably supervised the compass comparison from the wheelhouse end. I don't know what he would do in between. Perhaps on long runs where the course wouldn't necessarily change from one hour to the next he would be available as an additional pair of eyes when not supervising the QM?