Lamb is a half who has always played a very organised style.
Coaches have always loved him because they make a plan, practice it at training, and Lamb makes it happen during games.
He is the king of the set play and the try assist.
Brown doesn't value that as much as he values running skills and off the cuff play - and he tried to get Lamb to develop those skills - and to Lamb's credit, he did change his game a lot under Brown, but isn't a good enough athlete to pull it off.
In the juniors he was able to sit back and choose his moments to get involved, and he usually made something good happen when he did jump in.
He'll never fit into Brown's game plan, but plenty of coaches don't mind a half who plays like Lamb. Hodko gets plenty of gigs, and he is basically an old and busted version of Lamb who can't kick or tackle anymore.
Lamb should pack his bags and go somewhere where they'll let him play his natural game, even if it's ESL for a few years.
His only hope at Newcastle is if Brown moves on, because Brown doesn't like his style of player.