There also seems to have been quiet some tension between hide and Taiji:
Taiji being fired was eventually brought about by Hide. He told Yoshiki “not one more day can I work with Taiji”. Yoshiki claims to have attempted to keep the band together but eventually found Taiji’s “difficult and reckless behaviour” too much, and fired him.
Source
In that I strongly doubt. Hide cried when Taiji left, my bad, when he was made to leave. From all members Hide and Taiji were like twins, there was something between them that actually made them one of the best team I've ever seen. You can listen this in their music, and of course the difference when Taiji was fired and Hide left a little after that. I don't know if his aparting have something together, maybe he too didn't want Yoshiki to tell them how to make their music anymore. Artist more than anybody needs to be free, if someone tells you how to play it's not art anymore.
Anyway, "they said", "I heard", "my friend told me that he read" are just nothing more than rumors. I cannot believe Hide was such an idiot to ask Yoshiki behind Taiji's back for his dismissal. This is against everything I know about this guy.
After all, Yoshiki loved Taiji and asked him to rejoin years after that, and in his autobiography Taiji says he was pissed off but he never blamed Yohiki. We are just bystanders, we never been in their situation, working together on the same project, sacrifising personal life, free time and health for the band. I think that's the reason Yoshiki is so jelaous about X, it's his child, his product and his life. I also would like to quote Taiji, who said:
"To me, X had to be perfect. If nobody pointed out the shortcomings, I didn’t think we would be able to rise to the top. That was my duty. Yoshiki and I frequently collided and there was no forgiveness from the other members.
That’s why I was disliked by the other members, and I was feared by the staff like a human bomb. Even so, everything around me had seemed fine.
The way I behaved was all caused by the fact that I really loved X."It seems he wanted X to be their masterpiece, as Yoshiki, as Hide... And I understand him, I am kinda like him. I can burst, scream, fight and break things, and ten minutes later I will not even remember about that. I will do my work while other people around me will be super offended and afraid to walk near me. Taiji wan't dangerous or rude, he was just concern for the band. And honest, painfully honest, which is not something everybody would like to see. People often prefer to smile and pretend than hear/tell the truth. Truth is something that hurts.