It wasn't a public petition like when a full-page newspaper ad in the New York Times advocating the release of a political prisoner and signed by Nobel laureates is published. It was an under-handed coup attempt when, as a man with a TV pulpit and who's the go-to guy for a pithy quote, his attempts at persuasion failed, and he obtained signatures by misrepresenting the situation to fellow artists. It was never meant to go public: it was leaked to the press.
Lawlessness breeds lawlessness, and step one is to try to establish illegitimacy. That he's been agitating relentlessly within the company is no secret. It's no surprise that, while the translation of Tsiskaridze's literal words were that if Iksanov were Orthodox, he'd understand Tsiskaridze's relationship to Yanin, does anyone really think he wasn't also saying "He's not one of us"? He's the self-proclaimed "preserver of ballet orthodoxy," which is funny when you think about it, with the Bolshoi rep having works like "Spartacus" and "Carmen" so affiliated with the company. You'd think from his words that he was chaneling Petipa, not Grigorovich.
In a blog post ranting against "the tyrant" Iksanov and the Bolshoi renovation, Anastasia Volochkova also made an issue of the fact that Iksanov's birth name was not Anatoly, son of Gennady, but rather Tahir, son of Gadelzyan.
Of course this can be taken to mean that "he's not one of us." Or perhaps, "The man is fundamentally dishonest. He even lies about his name."
Long ago I remember reading an interview with Helena Bonham Carter in which she described overhearing a group of people at a party trashing her. Apparently the final nail in her coffin was: "And her hair isn't even real!" If someone is determined to dislike or hate you, just about anything, even the wigs you wore in period movies, can be used as a cudgel against you.