I don't agree that Tyson was an inside fighter. He actually took a lot of criticism in the early days for not fighting on the inside (watch the Pinklon Thomas first few rounds)

I recall that Tyson used to unload on the way in, not while he was 'in'. Perhaps people think he was an inside fighter because his preferred punching range was inevitably closer than the other guy's because of his much shorter arms. Tyson was actually quite passive on the inside and allowed himself to be held, so the ref could separate them and he could start his approach run again.