Considering the stateliness of Ashley Wilkes, I could see Tyrone Power, but as Ashley shows certain weakness in the latter parts of the film, I'd have to place a maybe on that. I think Leslie Howard did a fine job.
I could see Ty as Captain Butler, with enmity on his face, "Frankly m'dear, I don't give a ****!" as he storms off from Scarlett, although Clark Gable was excellent in the role. (Also Ty taking Scarlett up the steps in that very dynamic scene.)
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Howard was brilliant agreed. Other than his age, he truly was one of the best choices.
Gable was untouchable in that role--no one could have topped him, imho.
". (Also Ty taking Scarlett up the steps in that very dynamic scene.)
Read somewhere that he had to carry Vivien Leigh 13 times up those stairs with all the retakes. However, she was very light apparently and it wasn't an exertion for Gable :-).