Regardless of the margins involved, I think it is improbable that AZ would want to produce an obsolete vaccine when those facilities could be producing a better

Regardless of the margins involved, I think it is improbable that AZ would want to produce an obsolete vaccine when those facilities could be producing a better one if they have something ready to go. Its not like everyone involved here is a sociopath, they can put the money down now and renegotiate for a mutually beneficial change to the contract.