If I add an account to a cadence, can I automatically see their module data?

You can immediately see the module completion and share status (i.e. Module Acquired, ASC, VRF, etc.)  for each account that you’ve added to a cadence.  But module data (responses) cannot be viewed until the account accepts your module share request AND posts the module. When an account is added to a cadence, they are notified and sent a request to share their module with your account.