Bob was quite an upright fighter, but he could move in the pocket like James Toney. Do you wanna stand in the pocket with Kovalev? I don't know. Hard to say whether he'd get the leverage on his shots or whether Bob would be able to counter effectively. I give Kovalev a big advantage here.
Going with the bigger, better schooled Kovalev to make quick work of Fitzsimmons. Fitzsimmons would run into some straight rights and wake up wondering what had happened to him.