The more you try to unlock it the harder it will be to unlock. Recovery works on a point system. On another note, if you're denied for creations, it usually means passes, or vise versa. But this is not always the case. Try researching the account itself to find more information on the original information and the earliest relevant information regarding that account. Try to make each lock appeal precise, and filled out to the best of your ability. If you have his IP, you have his ISP, zip code and location, so utilize that information and use it to your advantage. It is more likely that the dual unlock attempts between you and the original owners will drag the account into a sort of "ditch" where it'll simply become next to impossible to unlock.