But The X Factor already has a perfect closer - The Unbeliever. This song can't be put anywhere but the end of the album. The band's decision to open the album with an epic was ballsy, but I think it perfectly introduces it. It's precisely not "just" an epic like Rime or Wild Wind, because it works much differently. It has a strongly composed beginning that mounts tension in a way you expect something big to follow. This effect works both for the song itself, and for the album that follows it. If this tension were released only in the song and there was nothing to follow up on that, especially because Sign ends in a similar way as it starts, I'd feel quite cheated to be honest.
You see, Rime has a certain fading element to its end. It produces closure. The same goes for To Tame a Land and Alexander the Great. I can't help but think these songs were meant to be followed by silence. Wild Wind is similar although it ends the same way as it starts, because it tells a progressing story that gets closure in the end. Sign is different. It ends on a brooding note as it began, as if the questions raised throughout the song - both lyrically and musically - remain open, to be answered by the rest of the album.