Okay, so having the contract wasn't the key factor. Instead, the proper interpretation of sam_goody's comment requires us knowing ... what, exactly? When the l

Okay, so having the contract wasn't the key factor. Instead, the proper interpretation of sam_goody's comment requires us knowing ... what, exactly? When the last Thiokol employee touched the the engine? When Morton Thiokol made the first design change? (https://history.nasa.gov/rogersrep/v1ch6.htm https://history.nasa.gov/rogersrep/v1ch6.htm says there was a design change when 'new Randolph putty was eventually substituted for the old putty in the summer of 1983', but that started in 1982, before the merger.) So, when exactly was that? What decided the moment when we can say the SRB motor units were something was Morton Thiokol's first attempt at rocket building, and not Thiokol's?