I don't know. I find it very easy to take a bassline or riff and vary it - it's usually just a case of working out what scale or mode it's based around and change the order or rhythm. I find it very natural, in fact, it's fun to learn a bassine verbatim then re-work it somehow (moving it from 4 to 5 string usually helps to shake things up). But... the way Giaccomo plays EXACTLY the same tempo, key, note-for-note is weird. When someone does that for a well-known song they're showing off thier ability to mimic and their technical virtuosity, but if it's an unknown piece why would anyone not put in some of their own signature, their own style - voicings they enjoy that kind of thing? No. I honestly think he's devoid of any curiosity (he's said he doesn't practise scales or know any theory) and isn't interested in what's behind a piece of music. It COULD be lazy/stupid but I still think it's as much down to just not having any kind of musical creativity and imagination.