I don't know, I just don't see it.
What I see in Jock Madden is epitomised by that 79th-minute error, where he does really try hard and looks to be in the right places at the right time, but lacks killer instinct and has almost zero threat in attack.
If we comparing him to Luke Brooks, that's a very low bar to set. Madden should be clearly pushing himself in to replace Brooks, because Brooks has had 150 lives and nobody will shed a tear if he's dropped, but Madden has not offered anything superior, with his only defence being he is some 145 games junior.
Madden doesn't straighten the play, I've yet to really see a passing game and his tactical kicking really isn't any better than Brooks.
Maybe if you keep him in long enough he'll become a half-decent tough halfback who can kick and tackle, but I can't yet see how he will ever win you a match, or create fear in the opposition. He would need a pretty high-level 5/8th to do the creating for him.