I'm not sure I agree. Phil Neville and others from his generation have spoken many times about the role Cantona played in getting them to work more professionally. It's been widely reported that Wenger had a similar role with the players at Arsenal.
In cycling terms, the British Cycling team have invested considerably in the mental aspect of the sport and there are a wide range of sports now investing in tools for improving spatial awareness and decision making as well as resilience and conscientiousness. Now you could say Ross is too daft or something to do any of this, but again, he's been with us since he was a kid and so I do wonder if he was allowed to coast on his natural ability by those at the club rather than working on vital areas that he wasn't so good at.
I mean Ross is one of a number of players stretching all the way back to Kenny who appeared to have tremendous natural gifts as players, but have lacked the mental aptitude to reach the very top. Heck, you could argue in some ways that Rooney also falls into that camp. Given that so many players have failed to fulfil their evident potential, it begs the question why the club don't do more to rectify it and address the mental side of the game more.
I understand your point and perhaps I was slightly simplistic in my point, as rightly anyone can make
some improvements in areas through training and tools.
However, there's a marked difference between being a professional sportsman and reaching proficiency in an area: the latter is sometimes simply beyond people.
For example, Phil Neville may have been a consummate professional, who reached the peak of his own potential, but he was never going to be a great player.
Admittedly, his passing may have improved and he may have made developments with his creativity but there's a glass ceiling - the inherent qualities we posses.
Furthermore, as an individual you have to be receptive to such support and be willing to make the necessary changes; these come back to the work ethic etc.
Again these can be changed but from experience they're traits that become engrained over a long period of time, so it's more often than not difficult to reverse.
Personally, I simply can't see Ross gaining the decision making skills needed to utilise his true potential, nor can I see him having the determination to reach it.