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In my humble opinion in with your current predicament I would wait and see what the new Nikon 200-600 looks like and if its good then bite the bullet and get the Nikon Z9.  I was a Canon shooter for over 20 years but wanted to move into mirrorless as it was clearly the future for photography so I jumped ship to Sony as they were so far ahead at the time, and I do not regret my decision for a second and love the gear I have . Having said that all the top end mirrorless cameras are superb and deliver great results and having had a good play with friends Canon R5 , R3 and Nikons Z9 there is nothing between them , each has a few features that others dont but they all deliver top quality images. The big pull for me is the familiarity and the overall cost to change and if Canon had got comparable mirrorless cameras to Sony at the time I switched I would probably have stuck with Canon for those reasons. The course of action you are taking in renting an A7RV is a sensible approach and you will no doubt make the right choice for you which at the end of the day is all that matters.