As I said, I am not really familiar with D&D. I assumed that the Monster Manual was akin to something like the Hero Bestiary. Shades of Black DOES require characters from the Hero Bestiary, but they are not main characters, so they are not my complaint.
If D&D publishes adventures that do not include the most important characters, that doesn't make it right.
I've played HERO games for years. I've seen a few times when adventures would suggest the use of characters from other books, but I've never seen one where the MAJOR characters were not included in the adventure. Most adventures included everything right down to the agents. (I do recall that the Genocide sourcebook used a character from "Champions of the North" as a top henchman for one of the leaders. But it was hardly a character integral to any particular plotline.)
If the new policy is not to include the major characters, it's a policy I don't like, and I'm voicing a complaint against it.
I love the HERO system and I'm happy to see it resurrected by the group that is putting out the new books. I want them to be financially successful. And the product, Shades of Black, is otherwise a fine one. If you have all the other books, I would recommend it.
But I want to discourage HERO from assuming that everyone has these other books when they put out an adventure. Or, at very least, a disclaimer so that you know what books are required.
I'm still curious about what books are required for the "Battlegrounds" adventure. There is no disclaimer on it, and I'm certainly not buying it until I know.