JT isnt the problem, but he is representative of the problem.
There was an article a few weeks ago that put my thoughts on the Cowboys into brilliant words (although I can't find it). Basically, they are tired! Green, as well as management, is attempting to always do what he's always done so he can always get what he's always got. He had great success in the first few years with Cowboys and he's trying to keep mimicking it, from the players to the game plan. Hell, they even kept Coote and were willing to lose Ponga just to trying and keep that 'winning' formula together.
But like any team (like any business or endeavour) its known that change brings success and when we are looking at footy teams, where players generally have 5 years or so at their peak (at best) you need to refresh your roster, refresh your style and refresh your mindset. Bellamy is the master at it, refreshing his players and playing around his core group. Roosters also did it brilliantly, copping 1 poor year in 2016 after 3 minor premierships, and coming back into second last year and now making a run for the top. Green has failed to do this. ANd make no mistake, Cowboys are just as cashed up as Roosters, but their downfall for recruitment is remote location.
Green should use this down year to refresh his roster, start really bringing through replacements for JT, Scott and so on. Maybe even Granville and Cooper (again, they lost Brandon Smith recently). Keep Morgan, Taumololo, Hess and a few others as a core and rebuild. Quickly.
Think about it - everyone raves about how brilliant is was to make a GF after losing JT. Maybe they made that GF BECAUSE they lost JT - it forced Green and the team to change their style, forced MOrgan to step up and try something new. And it worked. And now, they are trying to go back to what worked in 2015, rather than build on last year.