OK, if we assume that all Xiaoyao Pai arts merge congenital and acquired energies, then I will retract my vote for Xiao Wuxiang Gong
I must say that Ren Wo Xing (the poster) did us a favor by pointing out the nice attributes about DIB. I'd forgotten that DIB indeed does have the same auto-protect feature that Xuzhu and Zhang Wuji have, and when Xie Xun tried to sneak attack Reverend Kongjian, Kongjian's heart/mind initiated the intent to be protected, which activated the DIB, which knocked Xie Xun back several steps. Only when Xie Xun faked a suicide was it cunning enough to catch the good reverend off guard. But I'm willing to bet that if you take the same scenario and apply it to Zhang Wuji, Shi Potian and Xuzhu, they wouldn't be able to activate their so-called "Auto" protect either.
-If Xiao Feng faked a death, and Xuzhu rushed over to rescue, then Xiao Feng struck with maximum strength, I really doubt Xuzhu's auto-protect would be able to save him.
(recall that even the almighty Sweeper Monk had trouble taking half of Xiao Feng's maximum force while devoting his strength to attacking Xiao Yuanshan)
-If Yin Tianzheng faked a death, and Zhang Wuji rushed over to rescue, letting all of his guard down, then Yin struck with maximum force, I think Zhang Wuji would suffer quite the consequence as well.
That's why I think DIB is really quite good.