To understand Pro Sites, Network Enabled or not, and how it effects users.
To have Pro Sites control the use of a plugin or theme, that plugin or theme must be Network Enabled, correct?
If it is NOT Network Enabled, does Pro Sites have anything to do with it?
If it is not Network Enabled, how can an individual site admin have access to that plugin or theme? Can each one NOT Network Enabled but turned on individually for a single site?
Please explain how that all works.