A very detailed respond from you, for which I have to thank you.
But unfortunatelly the start is not quite "right"
.
To settle for the moment: yes the discribed situation and usage of the DS in your example is correct ... same is mine.
YOU make it work like a second chrongraph ... there are certainly not two chrono movements built inside.
But one thing is sure: it is watch that will create always big interest.
Hope all is well with you!
Best
Moritz