All makes perfect sense. It's about solidarity.

The line "When we go rolling home" has the same implications as "The day that the ship comes in" in Dylan's song. That is to say, "our day will come". (But in the meantime, rolling home from the pub after passing the bottle round can be a pretty good evocation of solidarity.)

And the wheel of fortune in this context also implies revolution, with the last becoming first and the first last.
..............

I prefer to sing the ending of the third verse

Our dreams fly up to glory
Our feet remain below,

which seesm to me to fit better with trudging through the snow, however hopefully, than bringing the lark in out of season. I don't know if I made that up or heard it. Probabay the former.

Which are the supposed added verses anyway? I've never hear it sung except with all those five verses, frequently repeated a couple of times.