Stoner's crashes in 2007 are the same as anyone who has ridden the LCR at the front of the pack. His results on that bike are beyond what anyone else has accomplished. It seems to me that if he was willing to push that hard and accept the risk of crashing, mental toughness isn't one of his flaws.
As to his later crashes, Rossi has done the same on the Ducati. It would seem that since Rossi isn't known as a crasher, we have to blame the bike not the rider.
Mystery ailment? Mental weakness on the part of his doctors is hardly something you can pin on the rider. Once diagnosed, Stoner has been in top form. It is sort of like blaming Rossi for his doctor's inability to instantly repair his broken leg.
At Laguna in 2008 Stoner learned a lesson from Rossi and no one has been able to do that to him since. In my book, that looks like mental toughness. He wasn't broken and came back stronger.
So, the evidence just isn't there.
well except the whole retirement thing
wahhhh i dont like the rules im going home
waahhhhh I dont like the press I quit
wahhh, I act like I dont care what people think but I get mad when they dont like me wahhhh

stoner just a prick. some people like that, some dont. every damned thing he does is tinted with his essential prickness.
weird illness that turns out to be lactose itolerance, dont tell my team or sponsors whats going on and miss three races with no explanation, then get butt hurt when the sponsor gets mad. sure, he was right, and he came back in top form, but was a prick about the whole thing. that whole thing is stoner in a nutshell. he WAS sick, and DID Have an issue fixed it, and came back stonger than ever. went about the whole issue withl ittle thought to anyone else.
the reality is, just like rossi, stoner only cares about himself. he just shows it a different way. hes retiring because he doesnt like it anymore. good, thats what he should do. I would never ask anyone to do things they dont want to do. but stoner aint no saint that just got a raw deal from the press and fans. its just that HIS Fans, like rossi fans, give him every excuse on the book.
wah, despite all that I can whip everyones ass waahhh