In your opinion (a very harsh one) they were stupid players. I remember them winning two back to back championships (winning you a packet of money) and a play off final. They also did well in the Championship although Charlie more than Jonah.
What they did as players has no bearing on their ability to coach (or in Jonah's case manage). I seem to remember Nathan getting us 4 valuable points between Christmas and New Year to get us out of the relegation zone. Let's face it, what you or I know about coaching football wouldn't even cover...