Don't think Coady was causing bother. Just in his stupid hamfisted way, Lage couldn't say "Hi Conor, Max and Nathan will probably start the season but don't worry, you will get plenty of game time and we still really value you". No, he has to leave him playing friendlies solely with the likes of Connor Ronan and Yerson Mosquera, who are clearly never going to play any actual competitive games. Superb messaging. So then he asked to leave.
For at least some time, you can get away with being a good tactician/coach but a bad man manager (allegedly this was Hoddle, although I'm not sure I agree with the first bit) or the other way around, which I guess Ken would fit into to an extent. It'll fall apart eventually but you can have some success along the way.
Lage was fucking wank at both.