Regarding the runners without course photos.
The photographer's website generates the each runner's page based on JSON data fetched via an XMLHttpRequest action. There is no session security, XSS mitigation, or throttling. You can hit the endpoint URL for any bib number and get back a result containing the number of photos present, and the roll to which the photo belongs.
I created a list of all of the finisher's bib numbers, then wrote a script to iterate through that list and save the resulting data.
The finish line photos are on sequential rolls, so I excluded images on those rolls from each participant's photo count.
The result is a list of two dozen or so people who have no photos other than crossing the finish line, for whatever reason. Looks like some folks took that list, and are trying to eliminate people based on whether it would be reasonable for them to not have photos; obscured bib, bib on back, etc.
The goal is simply to demonstrate the unlikelihood that Rossi was missed by the photographers.