I have no idea what you are getting at. Instead of asking me, why don't you read all of the references (JAMA, CDC, Johns Hopkins, etc) for the answers to your questions.
Here are the facts. After infection, the incubation period is 7-17 days, but is almost always 12. Following that, the patient will experience a high fever, general malaise, and severe muscle aches, usually rendering the patient bedridden. The prodromal phase usually last 2-3 days, in which they are not contagious. After that, the rash begins to form. Usually the rash begins to form in the oral mucosa and throat, then spreading to the skin. At the point the rash begins to form in the mouth, the disease is contagious, and for the first week afterwards it is at it's most contagious.
So I guess your answer would be, no.
Links:
I'm sorry to say that.
In one of the last outbreaks in Yugoslavia a man who was vaccinated contracted small pox, did have a fever and aches, a low level form of the disease, but he recovered without even knowing he had had small pox.
His case, where he had no idea he had the disease, ended up causing about 250 cases, including a number of fatal ones.
That was 1972 in Yugoslavia.
You were correct that there would be symptoms of one sort or another, but your discussion is seriously lacking in substance or analysis.