Since Gan Zhuo has already surrendered, naturally he should be put to use. Wang Xuan reports this to the Inspector Mansion while sending two of his men, disguised in Yangzhou Army attire, to seek reinforcements from Jianchang, saying, "Make sure to lure people out from Jianchang City."
Then Gan Zhuo will lead his troops to occupy the empty Jianchang City, while Wang Xuan orders an ambush on the reinforcements from Jianchang halfway.
Wang Xuan seems to trust Gan Zhuo, allowing him to lead mostly Yangzhou Army soldiers, but they both understand this is a test—a chance for Gan Zhuo to show loyalty to Luoyang.
If he can take Jianchang and defect, it would mean a complete break with Jiangnan.
Should he seize the opportunity to return to Jiangnan with his soldiers under the pretense of a feigned surrender, Wang Xuan will only lose a bunch of prisoners consuming food and an undecided Jianchang City.
For Wang Xuan, this is a win-win deal.
