Talking of what was picked up under investigation, can I highlight something?
During the Senate hearing with Clapper and Yates, it was carefully explained that the question of masking/unmasking of US citizens names arises in two circumstances:
- an intercepted conversation BETWEEN a US citizen and a validated foreign target,
- an intercepted conversation ABOUT a US citizen, by a validated foreign target.
Of course (2) explains some things which might otherwise appear contradictory.
Eg Sally Yates stated during the Senate hearing that she was not aware of any interceptions of the Trump campaign's communications.
This can be perfectly true - and at the same time it can be true that members of the Trump campaign were unmasked in intercepts of, say, a conversation between two Russians.