Couple comments from what I've read in a past life-
Regarding Cobham's
Spectrum
...Will Lee was supposed to be the bassist on that Fusion classic. Lee was already gigging with Cobham(in Dreams, I think?).
Anyway, at that time, Lee was playing a modified P-bass...the thing had about 8 pickups(?).

In interviews, Lee admits his tone wasn't really happenin'. So, Lee's in the studio & hears what sounds like the stuff he's been rehearsing with Cobham...that's how he found out about Sklar taking his gig on
Spectrum.
Ever notice Sklar's P-bass? The split pickup is reversed...the "D" & "G" coil is closer to the neck, the "E" & "A" coil is closer to the bridge.
In a Sklar inteview I've read-
He lamented(sorta) that most assumed he was a Folk bassist('cause of his affiliation with James Taylor, Jackson Browne, et al)...really, he was a Fusioneer & most didn't take advantage of that.
Also, one of Sklar's practice thingees when he was coming up-
Play a 33 1/3 rpm LP @45 rpm...I think Sklar mentioned practicing "I Saw Her Standing There" like that. Try to keep up with that tempo...eventually, when you go back to the original tempo, you'll have, like, a 1/2 hour between notes.
