Question: If I gavea stranger all 6 public keys, what do they get access to?

A) Nothing
B) Read access on the wallet
C) Read/ Write access on wallet
D) Other?

If I remember write when I was making this wallet it was my_seed + 5*pubKeys ... so my incarnation of the wallet is different to yours... and I'd guess at least 1 seed is needed in order for me to have an ability to sign something as distinct from the rest of you.