Correct, and furthermore, the reason for dual points systems is to create longer dwell time (points closed). You can not just "under gap" single points to create more dwell, because one, there is less wear "room" before the points wear shut and stop running, and two, longer dwell on single points causes them to burn because they don't open rapidly enough on the cam "rise." Single points typically have 30* dwell for V8, dual points typically 40-42 or so
Smart guy. Yes. One point set makes contact and the other set breaks that contact. The 2 sets are spread apart a few degrees to make that happen. My old Tech school teacher always said, dwell effects timing but timing doesn't effect dwell.
