Though YoYo claimed she couldn't disclose the opponent's information, she did reveal the talent of the water ghost. It might seem contradictory to her previous words, but in fact, it was the best choice in favor of both parties' interests.
Because, opposed to revealing info to Ye Weiming, this action served as a warning to the water ghost.
If Ye Weiming didn't know this, it would've been easy to knock their ships down with a flying dragon, even killing Ding Busi. But, the water ghost could also sneak beneath the water and sink Shi Xiaocui's ship!
By that time, none of the NPCs from either side, whether it be Reunited By Landscape, Little Foodie Fairy, or others, would be a match for the water ghost underwater.
But if it came to that, it's probable that nobody would be able to claim the mission rewards.
As for counting on Ah Zhong to make a breakthrough and save the day at crucial moments?