Yeah, it is quite the narrative. And @SaulGoodman is correct.
Consider it only took Reid 21 years to win his first sb.
In their first seven years as HC, McD has been to the playoffs 6x vs 5x for Reid. Hell his last 8 seasons in Philly resulted in 4 of those seasons NOT making the playoffs at all. It took him 7 years in KC to win his first SB. If not for Mahomes, Reid was the same coach as he was in Philly. A good coach who couldn’t get over the hump. IN 20 YEARS OF TRYING. Like McDermott, Reid was not a Hall of Fame caliber coach in his first 7 seasons . But Reid also showed for another 13 seasons that he wasn’t a hall of fame coach. If not for Mahomes, Reid wouldn’t have been KC’s head coach much longer.
I think even Josh would say yes.