Speaking as someone who is close to that pinnacle myself....
Seriously, the concept of there being a line of improved development from Monk Montgomery through Jaco to these gunslingers is anathema to the concept of Music as Art. Atheletes get faster, higher, further etc, not artists. Having looked for great players all my life, I have learned that there is always some other cat just around the corner. Great bassists canplay crap music, crap musicians can play great music. Technique is not just about faster but also about expression. It is all very complicated. Interestingly, guitarists seem to have stopped trying to speed up as the shredding has proven to be a dead end. Same with horns really. Its about the ideas now, not the process.