The guy which keep monsters as trophies when closing gates isn't he Navas? Or something like that? My mistake, it's Paul G. Red. Well, both of them can be used in the first scenario. And even in further scenario I think.
Yep, i got the scenario and, in the first one, you can use the following investigators only:
Navas, Red, Vincent Lee, Joe Diamond, Mandy Thompson, Bob Jenkins, Kate Winthrop, Harvey Walters, Amanda Sharpe and Darrell Simmons.