Rush's YYZ- A small nod to fans comes full circle

Rush is my favorite band, for reasons that are irrelevant to this post and therefore I won't delve into them. My first experience with Rush's music was the instrumental YYZ, which I heard on Guitar Hero 2. I dug the song, so I downloaded the first version I found on iTunes, which just so happened to be a live version. I found a similar version here:
I noticed this version of the song had an additional part that was added to the end (4:25 above), that wasn't in other versions I was familiar with. I wrote this off as live embellishment, and never thought much of it after that.

Several years down the road, I really dove into the music of Rush, buying their first 9 studio albums and becoming intimately familiar with every track. My favorite Rush album is their 1977 work, A Farewell to Kings. One of the weirdest songs on this album is the closer, called Cygnus X-1. This song takes place in media res of a sidelong epic that would be on the following album. The track features heavily rhythmic and technical instrumental sections throughout the song. (The sequence of interest begins at 2:24)

I also eventually acquired the original studio version of YYZ when I bought Moving Pictures, Rush's bestselling 1981 masterpiece. From here on, every time I would listen to this particular song, I would listen to this studio version instead of my isolated live version I had previously downloaded.

Several years later and a few days ago, I was simply listening to music on my phone on shuffle, and the live version came on. I enjoyed the slight variations to the studio version of the song, but my mind was blown when it came to the extra, added bit at the end. It was actually a sequence from Cygnus X-1! For whatever reason, Rush had decided to end a particular live rendition of one of their most famous instrumental works with a brief, obscure section from an obscure song from an obscure album. It was one of those moments where I felt like part of my life had come full circle, and that particular chapter had come to a clean end.