This came in from BG.
http://www.bluegartrls.com/forum/ffxi-advanced-player-discussion/66803-mythic-weapons-discussion-8.html
A player just completed Task and duties and obtained the Statless Tizona weapon. Apparently you do need the T4 ZNM pop items to enter the solo BC where you retain your subjob. The only problem is that at 1%, the player was only doing 0 damage and lost. To make matters worse, you have to re-obtain the T4 ZNM items to enter the BC again. SE really did make these Mythic Weapons a huge challenge and time sink.
Edited, Dec 10th 2008 8:34am by ImmortalAlchemist