Nah, Brahms was short and in some periods of his life fat (but not fat enough to use his weight in battle). Mozart was short as well, but he had opinion of agile person, so I guess he would bring our lovely donat down.
But in general they both are no serious matches for composers live Ravel or Mussorgsky who were trained soldiers... I wonder why they didn't fight - I mean in XIXth century you could legally arrange a duel between two gentlemens, so why didn't one composer, like Mussorgsky, send a satisfaction demand to someone who was more popular than him? "Dear sir Tchaikovsky, your new symphony is insult to me and I shall not tolerate it... meet me under the gate of Moscow in a week since now".
He would easily cut him into little pieces, then others and in the end there would be no competitive composers.
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