We don’t have any sort of formal standard for this sort of thing, but I think the way you quoted it in that thread worked well. I think someone could come up with a different way of quoting it that would also get the point across, so I’m reluctant to say that the way you did it should be the only way it is done from here forward. What I will say is that what you did worked, so stick with it.
I think compressing it might give the false impression that it is all from a single source and not from a chain of posts. That would end up just confusing people, I think. Don’t try to compress it.
Those were all from the same person, and clearly intended to be read together as a group, so a single quote box works fine. A discussion between two people, though, or statements from the same person made in different contexts, would be better as multiple quote boxes.