I think that expose is a bit of a rare ability as of now. Maybe it should dispel stealth and taunt when applied, and also block those two effects from landing, like a limited ability block.
FLanked as I designed is a bit of a different beast, and blocking uniques and leader skills is a very powerful effect against some characters if you take a close look. Not so much against others.
Given that there is also an assist meta, Flanked also makes assists fail.
If Exposed needs a little bit of extra love to be a more desirable ability, I think dispelling and blocking stealth and taunt gives it the right amount of extra utility.
