Good advice. The "X" factor in a good guitarist is if they can play with any body... in any situation... at anytime. You can sit in your room and run through scales back and forth and run through your sweep picking patterns up and down the fretboard... but when you jam with someone and they switch up a chord progression without you knowing it... you better be able to flow with it. Playing very theoretically correct and technical makes you sound mechanical... learn enough theory to where you have a good understanding of why... this enables you to develope a style because you have to basics of theory. The more scale structures you know the better you will be able to write things... but improvisation doesn't really come down to who knows more about theory. It's who can flow better between the scales, as I like to say.