I'm prone to agree here - None of the Ozzy guitarists have impressed me in the least, other than the fact that they're good "band guitarists".
Randy Rhoads is raved about, but he's nothing compared to the big names =/
As far as I can see, he was an image guitarist, like Slash.
Back on topic - I just reread the topic title - it says "Fast legato", if you're not sustaining the notes majorly, then why would you need a comp?