every time another character is seen in another's credits they are their LI (with the exception of scott and jackson). while everyone else is always shown alone. i don't know if it means anything but in the season 4 opening credits derek (and peter) are easily seen on stiles' board. while everyone else are alone in the credits. in season 2 scott is seen with jackson and allison. lydia is seen with jackson. again, probably nothing. I just found it interesting.