Ah the old Fedarov! The difference is Hugo made it work.
After Hugo made it work, and the Winchester design team had made it work, then Kalashnikov had the task to make it work again, with Hugo’s help.
Eggs ackley
I'm not so sure Hugo himself had a whole lot to do with the success of the AK. He was one of several German engineers and designers working under Kalashnikoff. His contributions were viewed so highly that his salary was cut twice, while that of other Germans on the team was increased.
He was a sick man for most if not all of this time.
Not saying he wasn't a brilliant man, but he may not have been at his best any longer.