Leaders assigned to Joeys can only see the members in the Joey Section. The same applies to each of the other sections.
The Group Administrator has access across all the sections.
Scouts is a hierarchical organisation and at the Region and State level there are assigned administrators that have broader access, to Scout Groups. Some of the CareMonkey data synchronises with the State membership database, but this does not include the medical profiles. The data/records are no different to the current data/records already held.