I am so glad that you raised this in regards Robinson’s tenure at the Roosters.Spencer Leniu becomes the latest high profile failure under Trent Robinson's tenure.
I firmly believe that he is the most over-rated coach in the NRL. Take away the 2 premierships with Cronk as “Captain-Coach”, this leaves Robinson only winning 1 premiership in around 14 seasons. He coaches at a club that has unlimited resources off the field and being the glamour club with such high profile board members like Politis and Bouris, their ability to recruit is at a distinct advantage through TPA’s and careers in the media post career (Keary and JWH recent examples).
The players he has burned include Kyle Flanagan, Brandon Smith, Dominic Young and now Leniu, and you could most probably add Mitchell Pearce to this list. There are others that I have overlooked that you will be able to add to this list. I believe the recruitment of DCE, which meant the release of a young Sandon Smith, was a desperate move for instant success to take pressure off himself.
The very good coaches improve individual performances and that is a pre-requisite of being an NRL coach, not throwing the player under the bus before his contract expires if he doesn’t bring immediate success to the club.