And as if Clark doesn't have enough identity crisis issues already! Really! The idea that he would take shifts being Superman with his brother rings true to me- but I think that Clark's twin would want to be his own person, and each individual would take shifts being Superman- but then that would further confuse Lois- and if she knew Clark and then met his twin, the idea of Clark or his brother ever being the *one* Superman would be confusing.
Assuming Clark's twin would be *good*. Maybe his/her nature would be evil, despite the loving family Jonathan and Martha provided. Then there would Superman and an equally powerful villain.
