So a year after Kafka developed him into a great QB? :)
Seriously, Mahomes clearly had all the tools, but he did need to be developed and taught the pro game since he was coming from Kingsbury's version of the Air Raid at Texas Tech. And I doubt Kafka was a huge part of it. But he likely did contribute to developing him no matter how small. And Mahomes himself has given credit to Kafka for helping to develop him.