Honestly, I don't know what in the world half-no, 98%- of these 'styles' refer to. Jirov was a guy with an extensive amateur background, and it showed in his style. He was real solid fundamentally- look at the way he boxed after he got hurt in the Letterlough fight. He had a good jab, good left hand good body puncher, good hitter, nothing truly outstanding, but he wasn't terribly deficient in any area. He didn't fight too smart against Toney but, then agin, he couldn't beat Toney if he had a tag-team partner and a shotgun.
Just a word of advice for all the amateur boxers and trainers of amateurs. Those first formative years aren't the time to develope one's style, their individual flair, or to teach them a ton of tricks. It is a time to drill and repeat and to master the basics of the art- each punch, the footwork, how to block and slip punches, basic counters. Get all that down. Then, when the amateur turns pro, they are prepared to learn more. It takes time to learn this stuff- and I'm admittedly as guilty as hell of teaching a kid natural left hook all kinds of stuuf he has no business knowing just yet and neglecting other stuff in turn.