With range and power I think you might be doing Axl , Mike Patton and the likes of David Lee Roth a little disservice ,
not saying that you would place any of them in the top ten if these where your main criteria for placing them in that category but many have a decent octave range.
this one again comes down to me at least as if you listen to the audio what hits a note with you as opposed to the visual.
Do they make you part of the journey in a meaningful way and take you to another place emotionally when you hear that voice.
harmonies and instruments can change and IMO do change the experience immensely.
I think it would be interesting as FOG alluded to in part if the voice was singled out without the accompaniment and you might have a completely different appreciation or not as the case may be of the voice.
Should a front man in a band you respect and enjoy get a gig like a Jagger a Plant a Gramm or a Rogers I don't know.
I could pick 10 I listen to a lot for their voice quality and great output satisfying your needs immensely and I wouldn't damage the score board I am sure of it.