New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
Correct, you can capture Moses, even if you control Moses. Previously you had to choose one to discard. That is no longer the case. Just as a captured Hero cannot be targeted as a Hero (think banding or Christian Martyr) a captured character does not count towards duplicates because it's treated as another card type (usually a Lost Soul).
He can definitely capture it. IIRC, captured characters lose their uniqueness or something. I remember this getting changed, don't remember the ruling.