On put backs: please note that MBIA in Q4 already booked put backs based on extrapolation of the rate of breaches. That means they have already accounted for put backs on loans currently not even in arrears. Based on this I really don't see where these new put backs, you mentioned, should come from. Zero new put backs is the best guess I would say.
On the other hand, you may expect that the current 1.5bn put back number over time will grow to ca. 4bn. This is when the amounts are recovered from the originators. That has nothing to do with new put backs though.