That sounds pretty good so far to me to be fair! 

Then we can kind of wing it and see which way we wanted it to go because I don't think we actually decided who was going to switch sides? But I do believe we decided that the end goal would be that one would end up swaying the other to their cause and change their loyalties or something? ouo 

Perhaps Yerbol wants to take the relic/scrolls/holos or information from that planet or whatever back to the Council but the Sith also want to know where the Enclave is so somehow manage to place Aria in some kind of infiltrator role where she 'pretends' (somewhat convincingly, or not, however it happens to go XD) to convert to the LS with the aim of feeding info back to Korriban in a sort of sleeper agent style role and then either she slowly manages to turn Yerbol to the Sith or he converts her to the Jedi? 
*brainfart over*