Well, SuitbertW,
As you read in the thread, I much support the pre-existence of the IWC over the Unitas, and therefore the likely 'in-house' construction of the modern Jones.
However, things are not so simple, and if you don't look at birth dates, I think the 2 are quite difficult to tell appart .
Unlike what you say, I would tend to agree with those who support that actually main pivoting points ARE similar.
Still, that does not change my conclusion that IWC came first with this layout and is therefore genuine in using it today.
See this composite picture of an Unitas 6497 and an IWC 'modern Jones'
As you see, holes match !
Initial picture of the encase Unitas:
And the modern Jones 98
I would say the match is quite good (But again I repeat IWC came first)