Guild Wars 2

I’ve been devoting my time online to Lunatic inquisition currently, and have noticed that a couple of toys work in the game, on either side.

My personal interest is in the [Bloody Prince’s Staff], which is a costume brawl item that is usable in the match. Notable about this staff is that, on a reasonably frequent basis, it can grant stealth to the user for no longer than a second.

My question about this is twofold.

Does the stealth the prince staff grant actually render the user invisible to the opposing team? Since it replaces all skills on the left, this would largely benefit villagers if true.
If it -does- grant true stealth, does this constitute an exploit? (Using Staff3 for mini stealths to gain added evasion, given the fact that any Mad king beseeches, attacks, or fears will disable the staff)

PS. Sorry for ignorance if the costume brawl stealth is widely known to not matter or be effective elsewhere. Not that knowledgable about most brawl skills.