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> if you think of ways to connect let us know, tanks
What do you mean? Ways to clearly factually connect Vanguard or Blackrock to Rothschild?
Digging ... lots & lots of it, with good financial data and piles of network-diagrams & notes. Go right ahead!

There are regular people like us who have done entire workshops on that, and come up with only a bit of info (like e.g. utangente.free.fr did back then).