It'll be easy to defeat Mao. Lulu has in the past used the strategy needed to defeat Mao in the past. Simply telling his subordinates a half truth to lure them into the trap. Lulu didn't tell his subordinates he was going to cause a landslide (he commented on the effectiveness of "haisui no jin" on this own people) or blow up that JLF ship (as bait and decoy to destory Cornillia's main offensive units and leave Cornillia vulnerable). if he can convince one or two people to take down Mao (CC comes to mind who is immune to the power of the geass or even Karen), he merely has to tell them part of his plan, then set up a trap by anticipating Mao's counterplan from the limited information Lulu told his collaberator