He's been amazing.
Very impressive work by Andy Reid, as well. I don't think anyone really doubted his ability to coach up QBs and offenses, but the word when Mahomes came out was that he could use a lot of coaching up, being too undisciplined etc.
They got him up to speed, in an offense that suits him, in relatively no time.
Great foundation for Reid to lose another 13 games in the play-offs.