but it would have been grand if it was sexual, and the TPTB were so ignorant about the potential that they left the "possibility" wide open.
Another theory I heard/invented is that Sam didn't like Naomi much because she resented that fact that this changeling (shut up) was a timespace splitted (splat?) widget and not her actual daughter who is probably on ice in a shoe box sized coffin in sick bay.
Her daughter died.
What ever this creature was, sooner or later it was going to go bad.