Currently, the CT automatically sets actor reach and size to 10' for creatures with a size of "Large." However, many lager creatures in the Classic Monsters module contain extra size info, such as, "Large (12')"... and for these creatures, the CT doesn't recognize the Large size. Basically, if the size is not exactly "Large" it doesn't recognize the size category.
This extra info is useful - if the CT looked for the size field to *start* with "Large" instead of exactly matching, the functionality would be more useful.