The launch of an AG* suggests that the PI is unnecessary to prevent irreparable harm - the harm already has been done.
Depending on just how the new formula works in a three way (w/ AG) there may not be much additional damage to MNTA. Counsel for Amphastar will not miss this.
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