Please let me know if I understand 16.43 Excess Cards correctly.
First each power in impulse order must randomly discard 1 card if they have more than 8 cards in their hand. They receive 1 resource for doing this. If some powers still have more than 8 cards in hand they SELECT which cards to discard to get down to a hand of 8 cards and receive CP equal to the CP value of the cards discarded which they must use for reinforcements.
So discard one car randomly and then select and discard cards until you have a hand of 8 cards. Is this correct?
You've got it. Remember, the random card CAN be a Must Play Card. If discarded, the Must Play Card is immediately shuffled into the deck. The cards you select CANNOT be a Must Play Card.