With the current foundation of the Xuanhuang Hall, and after subduing the Vermillion Bird Hall, the Xuanbaitu Hall, and the White Tiger Hall, it is entirely possible to go toe-to-toe with the Killing God Hall.
However, to fight both the Killing God Hall and the Shura Hall simultaneously—that was a strength Xuanhuang Hall likely did not possess.
To directly annihilate the Shura Hall would prove exceedingly difficult.
Chapter 451