It's a shame not to look at the possibility of Elizabeth acting on her own, because Gabe, if still with us, is a defenseless baby in grave danger. He deserves every chance that can be given to him to be found and returned to safety.
I can't really follow your post... no one said that shouldn't be considered or looked into. He could be in the same danger even if the Smith's are involved or if the truth lies somewhere between the two theories.