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Admiral Bill Adama - "Husker", Cylon War Hero.  Leader of the Fleet.

Pros:

• It would be a great "oh wow!" moment.
• Having a captain (and now admiral) in the Colonial fleet would be a killing blow to the humans.
• It could explain the close bond between Tigh and Adama…

Cons:

• If you are going to infiltrate the Galactica with Tigh, it doesn’t make sense to add Adama as well.  One would be enough.  It would especially be counter-intuitive if the cylons didn’t know they were cylons.  Adama would be on the lookout for cylons as well as Tigh and they could accidentally stop each other.
• He’s just too old.  He fought in the first war before the cylons had mastered creating human-looking cylons.  This would mean that he would need to be a human to start with and then replaced down the road.  Again, the cylons haven’t demonstrated that ability.
• He’s the father of Lee Adama.  Hera is supposed to be the first cylon/human child, but that would make Lee the first.

Overall:

While it would be a great reveal… that the Admiral of the fleet is a cylon… it just cannot work.  He’s too old and doen’t fit the profile.

Chances of being a Cylon: 2%