I'm going to go ahead and disagree with you on that. Before the year, Gallagher was ranked #82 in the BA Top 100 prospects. In his minor league career he had a 2.77 ERA and a 9.02 K/9. He has struggled in his two partial MLB seasons, especially with walks, which have been a problem consistently.
Matt Murton, as I'm sure you know, was traded to the Cubs in the Nomar deal, basically as a throw-in, something a lot of Sox fans were pissed about. His career numbers are quite impressive, although 2006 was his only full MLB season. Over 4 seasons, he has a .294 BA, .362 OBP, .448 SLG (.810 OPS). It's too bad he hasn't been able to play every day besides '06, he is a damn good player.
Can't say I know much about the other two, but that's my 2 cents.