Shalimar
First Post
there is no ambiguity to me. If an ally doesn't grant cover in melee, it doesn't grant cover for stealth purposes.Cover is relative. So an ally may grant cover against an enemy, but not against a different one at same moment... If you're not sure Just jump over their head and flank them. It's more cinematic ^^
The rules state that allies give cover, and then it goes on to list the limitations on the cover that the ally provides, it does not list stealth as one of the things that cover from an ally doesn't grant. Both your interpretation and mine have support, so when things could go either way based on interpretation thats pretty much the definition of ambiguity.
Besides its not like you should need to be totally hidden to have combat advantage. I think its pretty reasonable to be able to use the cover of an ally to let you make a skill check to be able to attack in an unexpected way, especially somene who is bigger than you. Since attacking breaks the stealth anyway, you don't gain the other and sometimes more important benifit of stealth, having the enemy be unaware and unable to attack you.