When working on updating personas journeys, i found out that the right order of reading might not be obvious for newcomers (was myself a bit confused).
The right order is IMO:

How can we specify the path?
One possible solution (if possible to implement), could be placing the milestones top-down and put a vertical line as separator between 2 columns. Another could be to put a note saying that folks should read it from left to right.
Ideas? Are there other ways?
Same is fair for other second-layer pages (Developers, etc)