Mr. Fang Zhouzi should not have got himself into Han Han ghostwriting accusation matter in the first place, because it is not in line with the principle of his anti-fraud cause.
To my understanding, Fang's anti-fraud campaign is (or should be) entirely evidence based, that is when a fraud suspicion is brought up, Mr. Fang would dig out indisputable evidence to support the suspicion. His goal would be clearly set. His goal would be to prove the fraud is a fraud in deed, as in high profile cases of Tang Jun and Xiao Chuanguo, etc.
However, in Han's case, such goal probably will not be achieved. Fang may raise loud accusation, allegation, speculation, but due to the nature of the case, ha may not be able to prove anything in the end. This will greatly discrdit his anti-fraud cause, and may help reduce his campaign to some tabloid thing.