As far as I can see, Ward is a dead man no matter which way he turns. I'm impressed with Skye's cool-headedness at the end there, even remembering to return the penny to its place above the door. I have no doubt that she left a message for Coulson and company, which means that Ward has almost certainly been outed to them as HYDRA. Presumably, Skye is going to give Ward a bogus set of coordinates, allowing Coulson and the others to catch up with them and rescue her.
I think that the situation with Coulson and TAHITI is a bit different, since that particular secret affected Coulson in the most personal manner imaginable. That was his life and his death and his own boss and friend messing with his mind.
Fury's survival - well, this is operational security. Coulson shouldn't have any problems keeping *that* secret, for the reasons you've spelled out.
I found Ward's behavior rather strange and inconsistent. I can see a few likely scenarios playing out here:
1. Ward is indeed Hydra, Garrett's evil protege.
2. Ward is Hydra, but he's not totally buying into the party line.
3. Ward is brainwashed or otherwise mentally manipulated.
4. Ward is playing a really deep game and is actually undercover trying to find out more about Hydra's plans and infiltration of SHIELD.
The episode tag focused on Ward, who seemed very blank and distracted while Garrett was telling his war story. (Of course, that just might be wooden acting on his part...) I'm guessing there's more going on here than Ward simply being an evil Hydra infiltrator. In any case, there is a very good chance he'll get killed by the end of the season.
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