''Your Tav's'' Mine might (?), that's why Tav's don't have a background and you have the DU new origin. Your Tav is what you make of it.
''Another side effect is that it's a bit far fetched that everyone in the party just happens to have some over the top background that give them a desperate reason to submit''
I suspect this might be by design and part of why those ''special'' people are infected by tadpoles in the first place. But it can be what you said too, we don't know yet.
