This is how I would rank them at this snapshot in time. I welcome your critique.
20% of Sweeper Monk means he is 20% of Sweeper Monk's overall power
Sweeper Monk 100%
Xuzhu 60%
Tianshan Tonglao 50%
Li Qiushui 45%
Wuyazi 45%
Xiao Feng 30%
GREAT WHEEL MONK Jiumozhi 29%
Xiao Yuanshan 28%
Murong Bo 28%
(Reverend Xuancheng/Xuandeng) 15%
Elder Kurong 12%
Reverend Shenshan 10%
Abbot Xuanci 10%
You Tanzhi 10%
Duan Yanqing 9%
Duan Zhengming 9%
Reverend Xuannan, Xuanji, Xuandu and their fellow monks 9%
Abbot Benyin and his fellow monks 9%
Ding Chunqiu 8%
Yellow Eyebrowed Monk 8%
Su Xinghe 7%
Murong Fu 7%
Granny Yu 7%
SWORD GOD Zhuo Bufan 6%
Taoist Buping 5%
LOTUS FAIRY Cui Luhua 5%
Duan Zhengchun 5%
Grandfather Tan 5%
Zhao Qiansun 5%
Gao Shengtai 4.5%
Granny Tan 4%
Big Boss Wu 4%
(Taoist Priest 9 Wings) 4%
Evil #2 - Ye Erniang 4%
Evil #3 - Divine Croc 3.8%
Elder Xu Chongxiao 3.8%
Bai Shijing 3.6%
Elder Xiang (Merit Transmission Elder) 3.6%
Evil #4 - Yun Zhonghe 3.5%
Deng Baichuan 3.3%
Gongye Gan 3.2%
Quan Guanqing 3%
Elder Chen/Xi/Song/Wu 3%
HE WHO KILLS OTHERS AT SIGHT Zhong Wanchou 3%
IMPARTIAL JUDGE Shan Zheng 3%
Bao Butong 2.8%
Feng Bo'e 2.7%
You Tanzhi's father & uncle 2.6%
Zuo Zimu 1%
ASHURA SABRE Qin Hongmian 1%