I disagree. His concept of the role of the bass in a piano trio (specifically w/Bill Evans and Paul Motian) was visionary. Before he came along, no one thought to use the bass as an equal melodic voice for extended lenghts the way he did.
If you've heard the "My Foolish Heart" rehearsal tape, you also know that he was integral in arranging and reharmonizing the tunes that trio played. His ear for harmony (if not actual voicings) was as good as Bill Evans and the pianist considered him a true collaborator in that respect.
Yeah, not to press this, I'll just share why I did as I did. For me, LaFaro is in the second category for this reason of vision/innovation, etc. I left him out of the first - although I won't argue that he might also belong there, actually - because I don't have any knowledge concerning his actual depth of musical knowledge; and knowing he died young, I didn't want to claim he was more than I know he is. That being, the second.
Any view of all this is fine, I'm not arguing or pressing at all. I just connected him with the second definition in my mind, given his approach. Visionary? Heck yeah.