I disagree. Take a world class sprinter and have him run 100 mpw and I guarantee you he is no longer a world class sprinter. Maybe not even a collegiately competitive sprinter.
Of course world class speed is genetically limited, but so is world class endurance. I’m a 23.high 200m runner during base/XC, but when I get in the weight room and do the proper sprinting work I become a 22 second guy. I was significantly slower than most of those marks during highschool when I never did explosive lifting or short sprint work.
Of course Jakob will never ever be a 45 second 400m man, but 47/48 for a guy who closes in 50-51 sometimes is definitely not unrealistic. Those 400m marks would surely yield a 1:43 or so for Jakob, but as our opinions line up here, Jakob wants to be a world beater. A 1:43.high all out guy usually isn’t a world beater these days. So the venture wouldn’t be worth pursuing.