This is where the realism gets kind of shakey. How would Sloane find someone that looked exactly like francie - considering that she must have been hired for along time to study her habbits, and also that she must be completly loyal.
I guess she could have gotten a face change thing - but still, complete loyalty...
And for her to have studied francie, slonane must have planned evertyhing in advance - unless he just studied her for no reason <just in case>
Anyways, i'd like to see how this francie interacts with the others...