Went back and watched "One of Them" from season two earlier. Its the first one with Ben and I wanted to see if he recognized Danielle or Sayid or if Danielle recongized him. Its kinda hard to tell since he was in a net when we first see him so we don't see his immediate reaction but Danielle is very adamant about him being an other and shoots him with a bow and arrow after Sayid releases him from the net which could mean she knew him.
I think when they made that episode they weren't sure if the show would last long enough to explain their history so they left it ambiguous. You could tell Ben was scared to death of Sayid but he was also beating the hell out of him in that episode.
