So where's your substance?
He hit the place mid-2011, saying it would take 5 years to get things sorted. In the 5 years before he arrived, the club averaged 45% wins and made the finals once, winning 0 from 2 finals. In the last five years he was here (up to 2018) the club won 55% and made the finals 4 times, winning one and losing one final in each year. They went from around 10th as an average finish to 5th or 6th.
If you listen to his podcast enough you will hear him say with his own lips that he believes it better to have sustained finals appearances than win a premiership one year and miss the finals every other year. Thus he considers himself a success at Panthers and most others would too, I expect.