Having just discovered Geddy Lee (I'm still fairly new to bass guitar) I would say he has to be on the verge of genius.... Playing those bass lines and singing over the top of them.. is pretty special.
For me his it's his technique I find incredible, it's like his attacking the bass... Like a battle of sonic wills between him and his bass...
Geddy: "You will give me this tone, you will conform"....
Jazz Bass: "Ouch... You're plucking waaay too hard.... Put me down"
........Ok maybe I need to reign in my imagination a little ☺️