I'd argue Taufua is ahead of him as well. Would you rather Fergo, Taufua or Merritt trying to pull down someone like Greg Inglis? Who for that matter is also top of the try scorers list from Fullback in the same team.
He bagged 3 against the Roosters which for me was the most form you can really count. Although you have constantly have written the Roosters top 4 chances off in other thread. While against either Melbourne or Manly he failed to get any points. Ferguson kicks goals (pretty average, but still does) and has scored 7 in 8 matches. Merritt has 11 in 10, plays for a better (more consistent) team and hasn't kicked at goal since 2008.
If you were pushing for Reynolds or Sutton I'd find it much harder to go against your point as there isn't much difference in the selection options in their positions. But for mine, Merritt is a good club player, but not the build you want for SOO.