None of them fits with Dugu 9 Jian. Here's what Feng Qingyang said:
1. 创制这套剑法的独孤求败前辈,名字叫做‘求败’,他老人家毕生想求一败而不可得,这剑法施展出来,天下无敌 ,又何必守?如果有人攻得他老人家回剑自守,他老人家真要心花怒放,喜不自胜了。
2. 独孤前辈当年挟此剑横行天下,欲求一败而不可得,那是他老人家已将这套剑法使得出神入化之故。
This tells us that Dugu Qiubai, with Dugu 9 Swords, already reached the stage of peerlessness and was desperately seeking someone who could make him block a stance. I don't think this can be before HIS. I mean, why the hell would he need to come up with a giant weapon if before that he was already peerless?