Originally posted by Saipjas
I am not sure that if the UCS died solar exaltations would remain, as we now have examples of other Chosen in 3e lore who have died off due to their patron dieing. IIRC in the Dev Q&A they mentioned that to kill off exaltations required either complete removal of the being that was able to be exalted OR removal of the source of exaltation, but I could be misremembering.
You are. Killing the Unconquered Sun would not stop the Solar Exalted.
Originally posted by The Wizard of Oz
but also wrote [the Unconquered Sun] as quite clearly having irresponsibly abandoned his duties.
It may be useful to view the Unconquered Sun through the lens of "former slave who organized a slave revolt to free his people" when looking at his relationship with his former duties.
It's also worth noting that the idea of the Incarnae being dangerously irresponsible only became entrenched after the game line switched over to the idea that Creation was in constant, imminent danger of annihilation from a thousand dooms. Third Edition has walked that back, allowing PCs to indulge in non-world-saving adventures without moral panic. This makes the question of how responsible or irresponsible the Incarnae are into something less dramatic.