Sorry, not to be argumentative, I’m just confused. The entire payload of the mission was 72 bombs, two per plane. And “a lot of them missed outright”. So how many bombs on target did it take to actually obliterate the bridge? I’m thinking not so many.
I think the accuracy of tactical dive bombing might be more fairly judged by a comparison of the number actually needed to effect destruction versus the number thrown in the bridge’s general direction.