Then we should agree that getting another coach who could treat the cause of the problem and not only smoothen its symptoms wouldn't be a bad idea.
I don't agree on sacking Tutu, but if he can add another coach to his entourage, I wouldn't object
I don't think his main problem is a matter of self-belief, actually it's a bit of the opposite; he set up too high expectations on himself since he became a toptener, get frustrated when his playing doesn't meet those expectations, lose the plot and ultimately the match; something that rarely happens when he was lower ranked and didn't care much for beautiful game and stuff, as long as it worked.
Failing to meet his own expectation probably contribute to him doubting himself a bit, hence, the self-belief problem kicks in. But I know what you mean, and I do agree. I don't think he cares much for beautiful game now either, he just knew that he needs more game to consistently challenge top players, and getting more aggressive is just necessary because you can't win a big tournament playing long matches one after the others. A lot of things contribute to the epic slump in spring, but end result was the self-doubt. I think when he was getting a bit defensive when ppl asked him about his top 10 status in the summer, it really sounded a bit like he was trying to convince himself that he belongs. But now, he's optimistic about getting back to that level and sounded a lot more confident that he will. I think he finally managed to put thing into perspective, and the injury has helped him focus on the tasks instead of wasting energy to think too much/care too much about what others think. I'm really feeling good about his chance to get back to top 10 next year, new coach or not, bar any injury of course.