Maybe, but then the "6" on Galactica shouldn't know that the final 5 are "near" either. Sharon/Athena hasn't said anything about the other 5 being near. It would seem that some of the 7 can see things that others of them can't. If the Significant 7 don't know who the others are, then why would "6" be trying not to think of them.
Seems like the Cylons do have the capability to alter their own programming, Sharon/Athena, Caprica 6, D'anna and go outside the bounds of what they were originally programmed for... why not Leoban too?