I'm wondering how the maintenance effort would be organised.

Would it be existing teams in the main functional areas (networking, file systems, user space tools, kernel, systemd &c) keeping the packages earmarked as 'legacy add-on' as they age out of the usual LTS, old LTS, oldold LTS and so on?

Or would it in fact be a special team so people spending most of their working week on the legacy add-on?

Does Canonical have teams that map to each release, tracking it down through the stages or do they have functional teams that work on streams of packages that age through?