I think you should go for RF100-500 (~2.3-2.4L); check the price with dealers. It will be an excellent combo. I use the same lens with R6. I am very happy with the same.
I don’t know about other pro-photographers or hobbyists like me. However, one ethical standard we should maintain while doing wildlife photography. The baseline is no-flash for me. The catchlight at the eye gives life to the photo. However, if you position yourself, this can be achieved even by playing with natural light and proper angles. I think many pros practice this also.
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