I mean he did spend 16 games and camp getting coached up and Mahomes says part of that was Kafka.
And if he was so clearly ready before he was coached at KC and it was obvious by watching the dude, why did he last until the 10th pick and why didn't Andy Reid start him in the first game of his rookie season?
I don't know what if anything Kafka had to do with Mahomes development, but it seems pretty clear that someone helped him get ready to start in week 17 and that Andy Reid at least didn't think he was really ready before then.