Do you mean the person who doesn't have any symptoms and has tested negative to ebola at least once? That person?
That doesn't mean anything. You can test negative, and be asymptomatic, for a long time while still carrying the disease.
The position of actual scientists that oppose quarantines doesn't rely on whether somebody tested negative for ebola. It's based on whether somebody who is infected is likely to infect others when they become contagious.
Are you suggesting that people should be quarantined regardless of the science?
If you don't understand the science, why do you expect those you disagree with to understand it?