Reid has been a good guy for a long time & I'm glad to see him get the win, not so much with Mahomes, though he's undoubtedly a great talent.
Shanahan lost the game for his team (as he did vs Baltimore, Seattle & Atlanta) by not being able to adjust his defensive plan for mobile QB's................a 4 man rush, with 7 pass defenders doesn't make as has been shown over & over when a mobile QB runs around for 10-15 seconds, DB cannot cover good receivers for that long, given the rules, so someone inevitably comes open. And Mahomes is plenty good to find them at least 2/3 of the time.
Lack of & aversion to blitzing & lack of getting to Mahomes enough, beat SF...................5, or sometimes 6 good blockers beats 4 rushers most of the time. And it did.
