It seems that up until Dooku revealed Sidious' existence to Obi-Wan, when the war began, that the Jedi Council never took any steps to finding the identity of the second sith in the 10 years following Naboo. They had an obvious lead in Gunray, who they could have offered to take into protective custody, given how terrified of Sidious he was. Could it be because they thought Maul was the Master, that his apprentice would pose no threat on his/her own and that were safe? Edit: That last word was meant to be Geonosis. Accidentally pressed the enter key before I was ready. If anyone knows how to edit titles, could they finish it please. Thanks.