Underestimating the administrator and the Land of Disorder would undoubtedly be a suicide mission.
Should the administrator become aware of their intentions beforehand, just dispatching a few God-Kings or Dominion Gods from the divine hierarchy could foil Lin Xun and the Evil God's plans before the challenge to the Profane Blood Sun even begins—there might not even be a need to send the Primeval Gods who created the world.
[...]
[Rakshasa Woman quietly awaits your response, not rushing you.]
[After much thought, you say to the Rakshasa Woman that you are open to cooperation with the Evil God, but under one non-negotiable condition—if the Evil God doesn't agree, there will be no possibility of collaboration.]
[Rakshasa Woman replies solemnly, "Please speak, sir."]
[You speak gravely, "I will challenge the Profane Blood Sun and use this as a lure to draw the Apostle of Disorder.]
[But before that, the Evil God must also join the battle to exterminate the Blood Sun with you!]