He was involved in all aspects of the development and construction of the watch. George and Roger did conceive of the watch. George passed on all of Roger's suggestions. George did examinee and approve the working movement and the prototype prior to his death. As a side note, Roger did make alterations in the coaxial (he explained the changes to me but I honestly did not understand or remember what he said about the changes in the movement but did say that it was an improvement and George agreed).
All in all the watch does have all the genetics of a Daniels.
It is a marvel to admire.
Mitch