To put it bluntly, if Zhao Tiaotiao insisted on going through with this deal, he might end up dead... and it would be a death in vain. After his death, the Song family and the Eastern Depot certainly wouldn't acknowledge any connection with him, much less seek revenge on his behalf.
Even if he managed to complete the deal, there was no guarantee he would get out unscathed. Should he sustain a disability or an internal injury of some kind, neither the Song family nor the Eastern Depot would take responsibility for him.
Of course, he could continue to wait, wait until those three young heroes left Wuchang before taking action, but what the situation would be by then was uncertain.
After weighing his options, Zhao Tiaotiao simply gave up.
