Why do you believe Holmgren so much better than McCarthy?
In 7 years in GB Holmgren had a 75-34 record and one SB with a .670 winning percentage.
In 10 years in GB McCarthy has a 94-49 record and one SB with a .656 winning percentage.
Very simple MM was handed a team with the ground work laid out for him and Holmgren was not. Add in that Holmgren was a much better play caller then MM seems to be. Edge Holmgren all day long.