There was no other young masters Leng Wuxin could contact, and the only one Jun Mengchen could get in touch with was Haochuan. Similarly, Haochuan's only contact was Jun Mengchen.
Lu Li had Uncle Nine and Jun Mengchen, an Earth Immortal Realm warrior of the Hao Family and Haochuan to wander around in the neighborhood to see if they could lure some more young masters and young ladies over.
Given the sheer size of the Forbidden Ground of Elder God, this was a task that had everything to do with luck. It would be next to impossible to capture an Earth Immortal Realm warrior outside the wind cave for Lu Li. One rash decision could lead to the destruction of the entire group. There was no assurance that he could win or not.