I read somewhere that Paul de Thours spent some time with Dolf de Vries in Holland in his later years and ended up "updating" his Bukti Negara system. That the BN that the large European organization is doing is now different from what PDT was teaching in the US in the 90's. That the European BN organization doesn't go on to teach Serak after the BN curriculum but does BN entirely as a stand-alone art. Can anyone confirm the truth of all this? Can anyone outline the differences between the "updated" BN of the European group and what PDT taught in the US in the 90's? I realize that here is a lot of politics and past bad blood around. Not trying to inflame things or open any old wounds. Just truly curious about any differences. Thanks!