Great point.
He's the slowest starter I've ever seen. He lost multiple rounds against a lot of challengers at LHW during the early goings. Even when there was obviously a massive gulf in class.
Boxers who had one punch knockout power yet were slow starters could make for an interesting thread. Carlos Palomino, Michael Spinks, Bob Foster and Danny Lopez could be patron saint candidates for that distinction. (Not Ron Lyle, who made a volitional choice to never stop his opponents in the opening round of a bout, and could never be accused of catching his opponents cold out of the gate, always letting them warm up first. Then, Lyle produced ten stoppages in the second round, and six more in the third round. Blin, Middleton, Pires, Mathis, Rondon and Scrap Iron were among his victims within that early amateur round distance.)
Because of the high profile Bobick anomaly, Norton is completely overlooked as a slow starter, recorded as having been knocked down a total of 11 times in the first two rounds during Kenny's career (mostly in the early years). Norton was really a mid rounds fighter, usually at his best from rounds 3-9. Not only wasn't he a fast starter, he wasn't a particularly strong finisher like Mike Weaver eventually became. (It was actually Ken who gave Mike the nickname Hercules for Weaver's muscular physique. Incidentally, both Norton and Mike were sharp outspoken critics of weight training. Ken expressed how weight training made Shavers tight and tired during Earnie's war with Tiger Williams, and Weaver injured himself in experimenting with weights during his WBA reign, postponing a title defense. Hercules has made it clear in interviews that his muscular physique was simply a genetic gift, like the sculpted body of light punching but elusive classy stylist Leroy Caldwell.)