Interesting topic and a thought provoking subject, @Youhave2minutes.
Lots of great suggestions, but given you’ve asked for only one, I’m going to go for Brian Andersen, former Coventry Bees’ captain and Danish international.
A classy rider who I imagine looked as relaxed sitting in an armchair as he did on a speedway bike. He made it look easy.
EDIT If I recall correctly, he won the British GP at Odsal in… 1997?