This is not established. Momenta chose not to argue that patent because the limited discovery did not give them enough information to argue it conclusively. With the full discovery that will attend the trial, the '466 patent might very well be in play.
Absolutely right.
It is astonishing what foolish things one can temporarily believe if one thinks too long alone ... where it is often impossible to bring one's ideas to a conclusive test either formal or experimental. J.M. Keynes