Vanish is not 100%, even if you macro Cloak of Shadows and /Stopattack into the Vanish Macro.
Still, everyone having the same abilities makes for easier and more efficient play.

The AV trinket, for teleporting to defense is a very good idea.
If the team is split, you can have everyone teleport to the same area.
And as a stealth team, you have a much better chance of rejoining the offense, if you don't want to play D.

I like the idea of having a Resto for heals, on the team.
But a tree is a marked target, most of the time.