I'm fairly certain I've confirmed this not only through site search but also attempting to navigate directly to a node in Share via the URL. I tried as, say "person D" to access a sub-space in "client A" and was unable to do so even though that node gave GROUP_LEGAL_USERS access (a group "person D" is a member of). It appears that since the sub-space is a child of a node that I cannot access, that I can't even access the child node directly. Confirmation from someone would be much appreciated. Also, if there's something on the Wiki that makes this clear, please point me in the right direction. I feel like I must be missing something as I'd considered this question fairly basic. Thanks!