As you already knew, The 1993 UN led election make Funcinpec a landslide victory over CPP but Hun Sen still want its position so that they make all of ways for getting the second primier. Many year later khmer economy boost again and it's time for Sen to get rid his partner from his eye. So in 1997 the civil war began in PP that make Rannarith and his accompanies staying abroad and making long time ago for negotiation with Sen's govt. This is the weakness of Rannarith
The Sam Rainsy today is better than Rannarith becos he can face lots of obstacles with Sen, but it's just first step in leading Cambodia being a democratic system. this is just an anti-current govt for finding ways toward democracy.
Rainsy can do nothing againts the Yuon's puppet goverment becos he need lots of time,money,troops,and many many more. So this is the weakest link of him. Hm if we could find someone who truely love Cambodia it mean our country will meet the same face that is Hun Sen again and again till Sen'll die.