Saber offense DOES add saber styles. It only adds them if you're using a single saber. Ranks 6 and 7 are bugged, they only exist because of a bug where the saber offense max cap is not set correctly (MAX_SABER_STYLES, which worked fine in JK2. Since JKA added two stances which add on to rank 3, this is broken). Since stances are technically added on to instead of changed, it's likely that the entire system is totally broken for stances because they did not do this correctly in a few spots (such as stance changing) Ranks 4 and 5 add Tavion and Desann stances, respectively, which are unused in JA. Changing from Desann to Blue does not work, you are stuck at Desann.