My opinion (see below for how I have defined these)

Outsider expert > establishment expert for public ally challenging and overturning norms

Any expert > layperson on the basic facts (ignoring statistical aberrations, of course)

“Outsider” being unconstrained by norms, not afraid to be cast out of a long established peer group

“Expert” has deep grasp of contemporary facts, second and third order consequences, puts in controls to remove cognitive biases, deep curiosity and healthy scepticism.

“Layperson” being someone who is probably intelligent, but grasps quickly onto unfamiliar concepts and data and makes heuristic calls based on limited data.