memorized licks can be seen in ALL jazz players solos, its part of the style of music. most musicians may try and limit how much of it they use and try to play alot of spontaneous stuff instead. Most of whats out there is a combination off both, like the Jaco stuff.
Its about using what you know to express yourself. memorized licks are a big part of that.
look at Charlie Parker, he had one lick that he played in almost every single solo. Why? because he wanted to. It was his signature lick. and it was/is cool.
jaco isnt only considered one of the best bass players ever only because of his improvisational skill(which he had a lot of by the way). He pretty much brought the electric bass into jazz. that's a big deal. In donna lee, he not only plays classic bebop licks, but uses his bass to emulate the articulation and stylistic mannerisms of a horn. On top of that he has countless very original and interesting compositions in numerous styles.
chew on that. Great comment !!! When I saw the idiot post Jaco was crappy I damn near crapped myself. I immediately knew the person making that ludicrous comment was a hater and I'm can't play at all