I find it difficult to believe this, as Isla himself admitted to have self-confidence problems after the injury in Udine... That doesn't mean that he does not give a fuck, but just that he plays like a pussy, and that's the reason I hate him. Have you seen him in the last 2 years? When he has to assist/score, every time his legs shivers and he freezes... You describe him like a poor man Padoin, but he isn't. Have you followed him in Udine and in Chile NT? I suppose not...
There is truth in that, but it's difficult to brand someone as a 'pussy' because they don't throw themselves into challenges after having a serious knee injury. Maybe he is mentally a bit fragile after that situation and even though it's been 2 years it's possible his game is still affected by it.
As for him freezing in good positions, I personally think that not only does he lack confidence but he also has poor decision making and not great ability. For all the games I've watched him for juve, previously at udinese and for chile, even when he takes on shots when he's through on goal most of them are miscued or scuffed and if he tries to pick a key pass, it's normally inaccurate or he's picked the wrong pass.
Either way I've seen him run hard most games, but defensively he's a liability as his positioning is poor and he goes missing on diagonal balls, he doesn't win many challenges and isn't good in the final third. We are in no argument in that his time at juve should be over this summer. Whether we can actually find a buyer, we are yet to find out.