Maybe, but remember that the first time we saw Athena she was impersonating Boomer and seducing Helo. It's not unprecedented for one Sharon to successfully impersonate another.
There was also that slightly creepy moment on the baseship when one of the 8's came up and started massaging Helo's shoulders exactly like Athena did...exactly. Turned out the other 8's had all been downloading Athena's memories and living her life in their minds.