I don't think it should. Hosted metadata is frequently going to be stale (most data on the web is, after all), while metadata sent in a recent statement is likely to be up to date. There'll be exceptions, of course, but I'm pretty sure that's going to be the normal case for when they're in disagreement. In a case like that, an LRS taking the metadata from a URL will be hurting, not helping itself. Also, it's unlikely the hosted version will include numerous languages, while if the activity (or verb or whatever) is heavily reused, I'd expect the senders to describe it in a number of languages. As we talked about at the workshop, I prefer a "MAY incorporate into its internal representation" language.