Yes, it allows for memorization of shuffled decks. For instance:
J 
- J would be represented by a person of number 550 (J-J-Suit)
8 
- 8 would be represented by a person of number 388 (Suit-8-8)
(Just added these to the examples list. Thanks for pointing out this case)
In this respect, D2B would work like the Ben System, the Shadow System, or any other 2-card system; namely, it would be possible, but you would have two repeated images. You would divide the cards into pairs and memorize one after the other.
The sequence: A 
- A - A - A - A - [next card] would become 3 pairs
A - A would be represented by a person of number 011
A - A a person of number 011 as well
A - [next card] depends on what the next card is
This repetition wouldn’t pose any problem both because it’d be extremely rare and because there wouldn’t be many repeated images.
Thanks for the link! I’ve looked at this website a few times when I was filling my 3-digit list of people. However, now I’m filing my objects list, which will only contain Portuguese words (my mother language), so this list won’t help much anymore. Thanks for your thoughtfulness, though!
If you have any further questions, feel free to ask.