That is, when you create D, you can link D to A, B, or C, but not A and B. This grants bonus AP to A,B, or C. Likewise, if you rebirth A, you can link A to another character (I have not rebirthed with a Hero talent since, so this is an assumption).
Flagship was one of the first of the traditional merchant account providers to offer free account setup, with no application or account setup fees being charged. The company was also among the first to offer true month-to-month contracts, with no early termination fees for closing your account.
Flagstaff is small enough that you can either walk, bike, or get around town in a taxi for about $5 to $10 per ride typically. There are also shuttles and tour buses that leave to the Grand Canyon and Sedona from Downtown Flagstaff.