I looked at this in more detail and I don't think we should do too much magic here from the tooling side. If the schema that is referenced in the config file doesn't exist (which is the case for the webflow example mentioned above where the non-versioned xsd is not available anywhere), there is not much that we could do. We could use the versioned one that exists, but what if there are multiple versions? So I tend to not do any magic in the tooling just to hide the fact that the non-versioned schema is missing or that the config file isn't correct (with respect to the missing schema).

Cheers,
-Martin