Lafleur is the most fortunate coach I know. HE got a promotion to GB after fiekding a mediocre to sub par offense for the Tutans (that subsequently had a much better year the following season)
I dont think he would be successful anywhere else. The only thing he has going for him is that he brought back a commitment to the run that the Packers got away from. It worked well because the GM invested alot in improving the defense and all of a sudden Aaron Jones is playing at a serviceable level. He walked into the best possible situation for him.