Yes I agree it's fascinating to see how the campaign is playing out. Your statements are really insightful - glad you could glean this from our tool.
To answer your other points - the reason other parties aren't included is that they haven't paid for any Facebook ads yet (somewhat surprisingly perhaps).
Also, given Twitter is banning political advertising, Facebook now has the lion's share of the audience on social platforms at least. Instragram & Messenger ads are also included in this analysis.