X doesnt need hide's "originality". Thats what his solo tours were for. That is why you can easily replace him.
Well, it's okay that you dislike his 'originality'. Opinions and nothing but subjective.
But there's something; a band is a creation of all members. It doesn't reflect
only their leader's or more influential member's work.
A silly example, the Rolling Stones. If Keith Richards died could anyone replace him? Yes, they could. His close fans would be revolted, others wouldn't really care.
With hide is the same thing. For some he was unique and essential, for others he was a mere childish man who played guitar.
No need to find an agreement in whether we was replaceable or not.
=)