Hah ya, the BST's who spent all their seals on other stuff prior to the BB items being made accessible through ks99. I think the hardest part now is getting the turtle to drop the egg. I know Behemoth and Faffy have a very high drop rate, but that turtle might be below 50%.
The drop rates are all equivalent (approximately 1 drop for a group of 6 on average), the turtle is only hardest in terms of how braindead you're allowed to be in order to win the fight nowadays. Wyrm and behemoth are both jokes, but for the turtle you still need to plan a way around his regen.