I think people just like the idea of it being WFS/LTL part 2, except that those actually have an obvious and strong musical link.
That's really stretching it, though. I mean, if I had to pick a WFS/LTL part 2, I'd give it to Vacant/Stream of Consciousness, even if SoC is an instrumental.
But either way, even if people like the idea of FFH/BAI being WFS/LTL part 2, it's not. Like people have been saying, the link is much weaker than that, to the point of being virtually unnoticeable to most people. It's cool that it's there, but I wouldn't consider the two linked in any way. They work really well as independent songs, and playing one after another, the link is completely unnoticeable.
Even in Learning to Live, the opening keyboards have a structure very similar to the main melody in WFS, so it's much easier to establish that link right off the bat.