I like the target marking, shadow fighter buff line, this sounds like a great way to make up for the captain's becoming more focused (or weaker, depending on who you ask), especially if gear isn't swappable in combat with Helms. there's several current raids where an off-tank buff guard would be helpful in a game world where a captain can't do all things.
Kudos for making guardian more interesting and supplementary to a re-created captain.
LvL 100s: Beorning, Burglar, Captain, Champ, Guardian, Hunter, Lore-Master, Minstrel, Rune-Keeper
LvL 85: Warden, Minstrel
All my forum posts are my opinions and may not even be that. Also On Twitter: @leixicon