I'm not sure what you think they would have caught. "The Romulan commander is tense and is hiding something." Well, duh. They're from mutually suspicious cold war antagonists -- both sides are hiding something. For the duration of this mission, Spock, as Federation liaison to the I.R.W. Eletrix, was sitting in Troi's old chair. Elfiki sits at a science station on the bridge. Hegol, so far as I can recall, is not a bridge officer. Chen usually mans the conn.