Would Foreman have been the 1st round winner against Frazier if the 3 - knockdown rule applied?

Would Foreman have been the winner in the first round against Frazier in their first fight if the three - knockdown rule had been in effect? As Frazier was obviously down three times in the first round but was the boxer saved by the bell rule in effect? As Frazier went down the third time right on the bell. And Joe also had to be carried back to his corner after the third knockdown therefore might have been counted out anyway after the bell if the rule hadn't been in effect.