Dont think it was any specific player.
It was the squad. And we all know he was right. Despite the "gash" "terrible" shouts lobbed at some players, to get anywhere near the PL, you are a talented footballer. Top few % in the world.
Its attitude, obvs. And if you are playing against another PL team with similar talent, but better attitude, well, here we are. Roy Keane and Stuart Pearce were in the relegated Forest team 20 odd years ago. No one would accuse them of lack of bottle. But it has to be a team. Not a few committed players.
The dry rot has done the damage. Frank has just signed the survey report on a crumbling house. We might stay up, but that fundamental issue (squad) will still be here.