You should stick with your 70-200 + 2xTC if that's your preferred option. There's not much I can take with my 100-400 at the moment over here, but this is my local Robin waiting for his birdseed. It's pretty dark, iso1600 at 1/125s f/5.6 100-400mm II on 5DIII. There is no direct light on him to give contrast. It's a real 3D bird close up, about 3m away, so not all of him is in focus (I focussed on his eye).
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