VICKERS / DAVID "SIBLINGS"..?

reading the theory that Vickers is possibly Weyland's daughter, and since Weyland considers David to be his "son / legacy", would it be too far fetched, to imagine that Vickers is a less successful android model than David turned out to be...? the new footage that was revealed today, suggests that Vickers is "cold" while David is more personable, could it be that Vickers was sort of a failure to make an android more human / emotional, and David was more of a success...? that Vicker's emotional programming finally kicks in when she is experiencing dire dread towards the end of the film (when she's panicking in the corridor / escape module) and also, when she initiates a physical altercation with David in the corridor, of which i feel the words "A King has his reign / etc... is what Vickers tells David in a way to exercise her fledgling emotions in her jealousy of David being considered Weyland's "son" i could be completely wrong here, just speculating is all...