O'Brien had a better career than Flores, and we don't know enough about Daboll. He's been a coach for half a season.
Remember, Eric Mangini got the Jets to the playoffs in his first year as HC with a 10-6 record.
Romeo Crennel got the Cleveland Browns to the playoffs in his 3rd year.
Then there are the college coaches like Nick Saban and Bill O'Brien who had great success.
O'Brien actually started his career at Houston with 3 straight winning seasons, then 2 losing seasons, then he went 11-5 and 10-6, before he was fired after a 0-4 start in his 8th season.
Crowning Daboll the best is way, way, way premature given all the guys who went ahead of him and had some success.