I just reread Storming heaven and it was every bit as good the second time.
As the Tholians were attacking Vanguard, a thought occured to me:
Why wasn’t the Tkon array used to assist in the Battle of Vanguard? Sure they couldn’t target the Tholian fleet or take the array to full power (as Xiong told Jackson), but just switching it on would have brought great pain to all the Tholians on the attacking ships, hopefully making them unable to attack. Afterall, if the Tholians are all on the floor in pain, they can't fly their ships or fire weapons.