Somehow it's a fun fact that you can reach any other actor in four moves, but a much less fun fact that you can probably-reach any other actor in 2.6 moves. "Connectedness", huh. Though it was interesting to see that Frank Welker used to be in fourth place. Never heard of him. Or I've only heard of him, he's a voice actor. He does cartoon animals, often without lines, lots of miaowing.

He's done so much more than that. While he is likely many animals you've heard, he's also Megatron and Soundwave from Transformers, Fred and Scooby-Doo, Apu from Aladdin (ok, this is another animal, but he got significant screentime), and Ralph the guard in Animaniacs.

He's Megatron, amount others.

Yeah, I think an argument can be made that frank welkers presence at the top indicates voice acting should be treated as an optional variant.