The more I review the rules on this, the more I think that Stealth isn't about being seen, but about awareness - that is, Stealth can make your opponent unaware of you if your DM deems the check permissible (skills overview), but it can't make you invisible (because it doesn't say so).
Notice that the Combat Advantage list differentiates between "unable to see" and "unaware," as separate entries.
Beautiful Roxlimn!
I was taking a particularly good crap last night, and I got to page 279-280 of the PHB and saw Combat Advantage. I'm looking at it and I read the list of reasons you can have Combat Advantage, again.
Unable to see the attacker (page 281) -- Okay, that's rules for cover/concealment, and total cover/concealment says specifically the target can't see you. The only mention of stealth is if someone wants to attack what they can't see.
Unaware of you (page 188) -- Well that's the stealth rules. Wait, there's not one mention of stealth granting combat advantage because the target can't see you. Only because they are unaware of you!
By that reading--Stealth keeps someone unaware of you, while Total Concealment/Superior Cover keeps someone from being able to see you. Either state grants combat advantage... but neither section tells me that stealth can make someone unaware of me after they are aware.
So after reading this during my late night crap (and again comparing my reading from every tactics section of every creature in every module/book), this only served to reinforce my decision to be in camp #2. Heck, even the stealth rules only mention gaining combat advantage for the target being
unaware. It's really ironic that after I read this, someone posts exactly what I saw right before me.
As far as the rules as written not supporting camp #2, yes they do--if I read them my way. I could
choose to interpret them your way, and be in camp #1, but the whole point is neither of us can say we're right, period. I can say I'm right
if I interpret what is printed my way.
And rogues should have combat advantage most of the time--it's pretty easy to achieve. You've got two rounds that you should have a free combat advantage. The first round (target unaware), and a Bluff round. Not to mention if you have a half-decent initiative, you can get a third round free with surprise. If you haven't gotten a flank set up within three rounds, you should probably look into playing an archer ranger.
Between a warlord and a fighter, our rogue has combat advantage on multiple targets pretty much at will.