I don’t think Morrison could slip the jab nearly as well as Tyson. And left hooks weren’t as much of a problem for Holmes as right hands were.
Holmes was well rusty in that Tyson fight. But look at it like this... TM could never do to Holmes what he did to Foreman... and at that time Tyson was much better all round then Morrison. Holmes gets shook up early and has the skills to survive to take Morrison into deep water. Holmes batters an exhausted Morrison between 8-10 rounds.
I'm actually surprised anyone would pick Morrison over Holmes. I realize this isn't the greatest barometer (far from it) but it bears stating: Holmes handily beat by UD the guy who kicked the living dog**** out of Morrison...several years after he lost to Tyson. Foreman and Holmes are two entirely different beasts.