Its possable that Ghirahim's tribe just might be the dark interlopers. it seems like they are after the triforce just like the dark interlopers were. the only thing that makes you think twice is the fact that Ghirahim looks nothing like the twili did in twilight princess and that the light spirts don't look like they will make an appearance in skyward sword(which I talked more about in my very first post).I think it would be cool to see Ghriahim's tribe turn out to be the dark interlopers because the whole banishment to the twilight realm would go futher into detail,and it would make more sense that way,but knowing the video games so well the be very careful of every making the games tie in completly.