I can’t say definitively how much of an aerobic component was present in Marita Koch’s training in the seasons leading up to her still-standing world 400m record of 47.60sec, but on the face of it theoretically at least, Bolt would seem to have a better crack at the men’s 400m WR (off his speed-based training to date) because there should be more of an aerobic element in a 400m race if that race is slower (eg the women’s 400m).
Yet Koch, who “supposedly” never ran intervals longer than 300m still destroyed the 47.99WR set by Jarmila Kratochvilova who still holds the 800WR. One assumes Kratochvilova had quite a strong aerobic component in her training diet.