The FindBugs report xml, for example, can be optionally moved with
<xmlOutputDirectory>
${project.build.directory }/findbugs-reports
</xmlOutputDirectory>
which makes it so the dashboard can't find the XML file. That means no findbugs section will appear on the dashboard.
I suggest, minimally, that the docs be changed to reflect special considerations for consolidated reports that can have their XML moved. It might say something like:
Do not use the findbugs <xmlOutputDirectory> config option if you want the dashboard to include the findbugs summary section.
A different solution, though it might take longer to do, would be to find the XML files even when they are moved. Maybe there is a way to get the config options from findbugs and look there.
Of course, there may be other reports summarized by the dashboard plugin that can have their xml files moved.