Board Thread:General Discussion/@comment-26319455-20150416234852/@comment-26206856-20150418173450

True, I'm more than likely overthinking as usual.

I'll drop it, but there has to be some sort of (unfinished at the very least) lyrics set to go along with the song. Performing it is a totally different thing, and it's not like they write lyrics at the last minute, do one take and it's done. The fact that the instrumental plays and immediately after it the (mostly finished) song plays that line with vocals means that the lyrics were actually there at the time of the episode. I'd agree with you if it weren't for the vocals being played in that episode, or the sung line wasn't the same.